I have a regular disney visa and also a premier. I signed up for the premier with the $200 gift card offer (had to spend X amount of money, maybe $500, in the 1st 3 months).
At the princess half marathon expo a couple weeks ago, I got a discount on my purchase- there are a few places in WDW that offer that too, though I don't remember which off the top of my head, maybe Mousegears and a few others.
I believe you also get that discount with the regular disney visa, and the 6 months interest free on disney vacations is for both.
If you spend a lot on the 2% categories, and/or don't have another card that has a good incentive in those areas, go for it. I also have a chase freedom card which gives 5% back on different purchases each quarter, usually one or two of those is at gas stations, for those 3 month periods I have to remember to not use the premier card, since I get more % back with the other one.
I've had the premier card about a year - first year, no $49 fee, got the $200 gift card incentive, and earned about $115 in rewards. I like it, and the designs are cute too