I also despised the Tomorrowland section! I felt like it was the hardest out of all the lands, even though it was one of the earliest. Really, really don't like the beetleworxes. The hardest enemy by far were the pirates, though. I just avoided them when I could. I honestly think the smaller enemies you encounter frequently are much harder then the big boss fights.
We don't really play video games at all, just Wii Sports occasionally, so this game has been a fun excursion for us! I really only bought it because of the Mickey/Disney connection, but I am so glad that I did. I will be sad when it is all over. I may go back and redo some of the earlier sections to grab some of the stuff I missed and look around more.
After you beat The Blot, can you go back and explore Wasteland? Or do you have to start a whole new game?