Count me in the minority on this one, too. Liked it the first time, but after 4-5 subsequent tries, I won't do it again unless there are significant changes. I'm a major classic films nut, but GMR actually seemed a bit lame to me the last time around.
I particularly dislike the tired old story line, with the guide "interacting" with the villain. I've never seen this done convincingly, and sometimes it's been so robotically performed that I just wince. To say nothing of the accusing looks of family members ("I can't believe we stood in line for this just because you like old movies," etc.).
I also wish they'd do a new film montage in the queuing area. I've never done this ride without seeing it at least 3 times. It seems they could rather easily extend the film to minimize the monotony factor.