Everest? Not close. Standard coaster with very little show in a pretty from the outside building. Almost everything in ToT WDW was ambitious / groundbreaking / state of the art / unique.
Perhaps in ambition Kilimanjaro Safari is close.
Interesting perspective and I can't say I totally disagree, however it's quite a bit more ambitious than anything we've gotten in the last 10 years with the following reasons and caveats:
1) Everest in 100% working order is quite impressive and detailed, but the Yeti is a huge part and the many effects rarely work (waterfalls, train stam, birds, music, etc)
2) The "pre show" is quite intricate and well done from a thematic perspective, building the story of the Yeti.
3) The mountain is beautifully done and just massive. The scale is something we don't see anymore
4) The short ride around prior to the first lift is a nice addition to a roller coaster, taking you around the "countryside."
5) A working Yeti is a game changer. When it worked, it was awesome.
6) The track change with yeti tearing up the track is a nice touch along with backward and forward motion.
7) A big part is the $100m+ budget in the late 90s/early 2000s when conceived. Disney just doesn't seem to spend big money on single attractions anymore.