i never got to experience Birthdayland, but Starland was around when i first started going to WDW. even as a kid, i didn't like it very much. sure, the store was cool (wait...was it a store?), and the show was pretty cool, and i liked going into Mickey's house...but from what i recall, that's pretty much all they had, except for the petting zoo type thing (which, i've never been much into petting zoos). oh, but remember all the cut-outs you could have your picture taken with? and the little, fake 'neighborhood' where you stomped on little shapes in the carpet sidewalk, and they would talk, or make noises?
but i'm like ISTCrew. the tiny building facades ticked me off as a kid. i wanted to be able to go into Daisy's candy store, and all the other little buildings, but, of course, they were all fake. they weren't fun at all because they served no purpose. of course, you could go through Mickey's house, and out his back door, you could see the other characters' houses, which were too small and fake. they looked cool, but again, they served no purpose. even when i was little, i got bored with Mickey's Starland. the major plus was all the character meet n' greets (which seem to be sparce in Toontown) i would often become jealous of DL when i would see video of Toontown on the Disney Channel. and then, as we all know, Mickey's Starland shut down, and reopened as Toontown Fair. i was a little disappointed that it wasn't as big as DL's, but was elated that there were 3 character houses instead of just one, and there was actually a ride there, which certainly livened the place up! i instantly fell in love with TTF! though, it's not my favorite land at MK, i do think it's tons better than SL!
btw, if anyone has any pics or video of BL, i'd LOVE to see it!