The only bad thing about using your AP for pictures is that they'll expire quicker than this little trick explained below.
If you get a regular Photopass card each time you visit, you have 30 days to upload the pictures to the account (by registering the Photopass card), then 30 days after that to redeem the pictures, aka 60 days. Using an AP will immediately upload the pictures, effectively giving you only 30 days flat. Depending on how many times you go back to
Disneyland that month, it may be more effective to use new Photopass cards. It's a little difficult to explain, but bear with me.
Ex: New photopass card (#1) used at the parks August 1-3, card #1 not uploaded yet
New photopass card (#2) used at the parks August 29-30, cards #1 and #2 uploaded on August 30
All photos on card #1 and #2 expire on Sept 30 or so
vs.
Ex: Annual passholder card used for pictures on August 1-3, pics immediately uploaded
Annual passholder card used for pictures on August 29-30, pics immediately uploaded
Pictures taken August 1-3 expire September 1
Pictures taken August 29-30 expire September 29
By uploading pictures from multiple trips using new photopass cards, you can save on purchasing multiple photopass CDs. Sorry for the long explanation, but hope this helps!