When I lived in Cali and had AP's, the rate that we hopped was totally up to us...sometimes we spent all day at
Disneyland, somedays at DCA, some days we hopped once, sometimes we hopped like bunnies.
For example, when I was there a few weeks ago. Friday was our first day, and we started out at Disneyland (to rent a wheelchair and so I could pick up my Thunder Mountain FP's, woot!) and then we went over to DCA. We stayed there until it was time for the first Disneyland parade, at which time we hopped over to watch it. When it was over, we went back to DCA for PPP, and then my cousin and I hopped back one more time to catch the PC pre-parade I missed. Went back to DCA, stayed the the rest of the day, and only went back to Disneyland to return the wheelchair.
On Monday, we stayed at Disneyland all day; didn't hop once, and on Tuesday we started at Disneyland, went over to DCA for the bulk of the day and then went back to Disneyland when DCA closed.
So, it's totally subjective...the parks are ridiculously close so you can do it as much as you want. Of course, it is a bit of walking and can cost time (i.e. from Small World to Screamin' can take 20 minutes if there's crowds). So plan out your day...but really, it's not a huge deal.