Fwiw, we were there over Valentine's Day and several days thereafter, and Encore was STUFFED. We stayed at Encore too - I can't decide if I like it better than Skylofts or not! Decisions decisions...
Anyway, not the best time to judge, since it was V-Day and President's Day all wrapped up into one, but Encore was buzzing. I think it's harder to tell if Encore is busy, though, because of the way the casino is set up. It's smaller, but it's almost boxed into little sections (those who have been there know it's a wee bit more intimate than your typical casino).
In the days following, Encore was still super super busy. We played Craps our last night there (the Tuesday following) and all the craps tables in the place were absolutely jam-packed with people at $25 minimums. Granted, they were all winning
Going next week (staying at Skylofts, but plan to patronize the Encore spa!) so I'll be interested in seeing what's up.