I really have no idea what people are talking about regarding the films of the 1990s not being well represented. Beauty and the Beast, Aladdin, The Lion King, Pocahontas, Toy Story, Mulan, A Bug's Life, Tarzan, and Toy Story 2 are all now or have been well represented at WDW. To say nothing of The Little Mermaid, which although it was released in Nov 1989, really could be considered a 1990s film. And Honey, I Shrunk the Kids / Blew up the Kid were 1989 and 1992.
True, less well represented are Duck Tales, Rescuers, Hunchback (although there was once a show), Hercules, and some of the lesser or co-produced films, like Doug and James and the Giant Peach, and of course, the live-action films are not generally very well represented from any decade, but overall, I'd say the 1990s are more well represented than many of the other decades.
Of course the golden era of 1937 trough about the 1950s could be expected to dominate, but outside of that, I think the 1990s are quite well represented comparatively.
And, please, Shrek is NOT Disney. Thanks you.