At the Resorts, have one of the scooter drivers park in the white rectangle you will find painted on the ground at the bus stop. If possible, the second scooter can line up behind the first.
Stay in "the box" until your bus arrives, and the driver has acknowledged you. (I always wave at the driver as they pull up, and they will typically wave or nod to acknowledge) If s/he "misses" the mark - (and they do) and parks the bus a bit further forward or backward from the rectangle, then wait until the bus has emptied, and the driver has closed the doors to "kneel" the bus. The scooter can then "reposition" and line up centered on the back door.
Make sure you have your strategy - since most of the buses will only accommodate 2
ECVs, you need to decide IN ADVANCE how you want to handle it if there is only one space available. (Maybe there is already a mobility device on board, or a mobility device arrived at the bus stop ahead of your group) If you decide to split up, make sure you have already decided (and informed your entire traveling party) of who goes with which scooter, and where you will meet up. Remember that it will typically be an *average* wait time of 20 minutes between buses. Don't make the driver and other passengers wait while your group tries to decide who will ride and who will stay.
Finally, one other place you may want to pre-strategize for the group is at Security at the Parks entrances. Assign one person to stay with each scooter driver through security, in case they need any assistance, and let the rest of the group go through as usual. (Think of it like "TSA Lite" LOL)
With a large group, the scooter drivers can easily let others handle things for them like QS lines.
And yes, there *will* be a "wind chill" effect for riders when temperatures drop; I always take along (minimally) a sweater for nighttime.
Regarding the giant sunshades that some companies rent: For inexperienced drivers especially, those can cause problems, as they can limit visibility. And personally, I believe that those are one of the leading causes of "
ECV rage" that we see in some of the other park Guests. Those sunshades can limit the forward visibility of Guests who are *behind* the ECV (not just at Parades, shows, etc. but even just moving through the Parks) They are a giant, moving target that those folks can focus all their unhappiness on... Although I personally would benefit greatly from a sunshade, I long ago decided to use a hat, gloves, and long pants/sleeves to manage the amount of sun I am exposed to.
Last but not least, there will be a STRONG temptation to use the scooters as "pack mules". Rule the first is this: Never Never Never ever, don't ever ever ever leave anything on that scooter unattended that you don't care about. If you go to Arribas Bros. and purchase mega dollars worth of crystal and then it gets stolen off of an unattended scooter? I have zero sympathy for you. No, people shouldn't mess with your stuff - and most of the folks at WDW won't. But not everyone at WDW was "raised right" as my Grandma used to say, and they can't resist the temptation to poke around in your stuff. TL;DR DON'T LEAVE ANYTHING ON THE SCOOTER YOU CARE ABOUT, AND DON'T CRY IF YOU DO AND IT GETS STOLEN.
But... there's other reasons to not load the scooters down, and they are important. First of all, every extra pound you add to the scooter impacts battery life. Next, the more "stuff" a scooter has on it, the greater the chance of a mishap. I have personally seen people with giant backpacks strapped on the back of scooter seats who forget, and then start backing up in the shops. Ends in disaster every time. And finally, be focused on being at Disney World, and not how much "stuff" you can bring with you. Tie a sweater around your waist, tuck a Coleman poncho in your back pocket, and put your Magic Band on. Everything else can stay at the Resort - you can get free water in the Parks. (And with Security checks, s/he who can go through the "no bag" line, wins!)
I hope y'all have a lovely, Magical trip!