yes... and it was exactly that which cheapened their appearance for me, at least. I had seen all of those before, and so--to me at least--it seemed like Lucas' fan service to just pile them in by the oodles in the PT. I would much rather see new aliens (like in TFA) so that I have something new to study and make into my own "classics" than just have the same old thing trotted out again and again because "hey...it's Star Wars. We GOTTA have Twi'leks and Tusken Raiders, or it won't *feel* like Star Wars". That line of thinking I simply don't subscribe to. I know some do...and that's fine for them. But all star Wars fans aren't the same...that's what makes it so special.
Plugging in new aliens, at least with the PT, was a distraction for a weak story. Everything could have been done in those movies with the aliens that had already been introduced in the OT, maybe throwing in a couple new ones here and there. But they went way beyond that. Not to say show/movies featuring new aliens doesn't work, but I feel like if people want to explore strange new worlds, to seek out new life and new civilizations, to boldly go where no one has gone before... JJ rebooted another franchise just for that.
Look at the TV series Firefly. They travel around to lots of planets... not a single alien in the show. Would Star Wars be more boring if there were no aliens? Probably. But I still feel like using the ones we've already been introduced to isn't a bad thing.
While it's hard to say that the OT set the baseline for all of the aliens that should have been seen in the SWU, the PT took it to a whole new level, which, just like the movies' technology, seems backwards. Unless part of the Empire's mission statement was mass genocide, so that by the time we get to the OT, they've wiped out the majority of the aliens races... It's not like you ever see an alien working for the Empire, even in a support role. British-accented white guys and droids is about the extent of what we got with the OT. Just like you don't see the sleek, shiny, new ships with fancy consoles and tech. It's all blocky colored switches, and beat up piles of crap freighters.
I feel like continuing to introduce new aliens is also backwards in the sense that we've been introduced to this galaxy far far away, where traveling at light speed is pretty normal. So more than likely a sampling of every alien race by now should have hopped on a star ship and ended up somewhere else and been seen by now.
Kind of like real life. We know what's in our world. While they still discover new animal species, how often are they so unique from something else that we've already seen.
I guess I'm just yammering at this point.