It's grossly overrated in the East and there really ain't much Twisted Evil
I grew up skiing/racing in the East. I really agree with the above statement.
Parhaps why there is so much pro-Eastern tree skiing vibe in this discussion -- is because it it the best experience the region can offer. Maybe some of the old twisting tails - like Goat, Starr, Rumble, Chute, Downdraft, etc. -- equal the sensation.
While tree skiing is pretty fun in Stowe, Jay, Mad River...outside os the areas near Burlington, snowfall is not enought to keep the glades in good shape for most of the season. Sunday River thinned some glades which are as good as any, but it does not get enough natural snow.
Some good glade skiing:
CA --I think the trees are too big in CA to offer great glade skiing. Heavenly, Sierra and Northstar are really nice. Especialy Northstar --- you can have low, mid, high intermediate ...and various levels of expert glades off of all the lifts.
CO -- Overall, the trees are a little tight - and without some powder to help check the speed -- they can be tough. I think Telluride, Aspen Highlands, Snowmass -- add Taos, NM -- ski similarly. Steamboat has some really nice aspens. Winter park too has some nice sections.
Northwest/BC -- I think this area has the best tree skiing on the planet. The fur trees are not as big as CA, so they offer more intimate skiing. I think there are some great trees at Crystal, Baker, Fernie and especially Red.
UT -- Powder/Snowbasin have nice trees. Parts of Alta. A lot of Solitude. Deer Valley, Canyons can have nice aspens. Overall, this is a really strong area.