Speaking of diapers, the changing tables in the restrooms are the only place in the park I try to avoid. I couldn't avoid ToonTown if I wanted to, because I'm a Gadget's Go-Coaster freak!
But I'm not into "a bug's land" in DCA at all, it's green and full of bugs and it makes me alittle queasy.
Toon town due to the fact theres only one way in and out and really long lines for kids rides. Tom sawyer island again due to the fact you have to wait in another line to get on or off the island. In DCA the Route 66 area and redwood creek area.
The only place I try to avoid is the bottleneck at Tarzan's Treehouse/Indy area. But we still get over there for the fun. But there are a few areas we just don't really go to: Toontown, for the already mentioned reasons, most of Tomorrowland, except Buzz and to walk thru from the Monorail. In DCA, most stuff on the other side of the Sun sculpture/waterfall, and GRR.
Toontown! I also avoid Peter Pan unless I am in line very early via "Early In". I also avoid Tom Sawyer's Island because I have no desire to explore it. It (TSI) is just not same as it was when I was a child.