I felt a bit different because I sometimes thought dungeons in GS and TLA (mostly TLA) went on for too long. I also beat the game and all the optional content and my biggest "complaint" is that the game is easy, which of course so were GS and TLA so it's not that big of a problem.
Personally I thought the dungeons had a perfect length in TLA. Hell, even Air's Rock.
Also yeah the game's easy. Even moreso than the other two. The only point of the game that I actually found somewhat difficult was the final boss. But that was because he kept spamming Psy Grenades and I lacked any items to restore PP >_>