I'd say try:
Lord of the Rings Online - exploration and lore heavy, and mostly theme-park, similar to WoW in its mechanics, with a stunningly realised world. If you enjoy Tolkien's books, or to a lesser extent Jackson's movies, I'd recommend this game.
Fallen Earth - an indie developed post-apoc MMO with an emphasis on first/third person shooter style combat. There are hotbars but they are for secondary and support skills rather than the core combat mechanics. A bit rough around the edges, but it tries to be different and often succeeds. Quite sandboxy. Recommended if you like crafting, western style settings and/or Mad Max movies.
Star Wars: The Old Republic - I haven't played it far enough to say whether or not the F2P model becomes too restrictive or not. You've played WoW so the mechanics will be instantly familiar, and if you like Bioware style storytelling you will like this, since it's basically WoW + Mass Effect meets KOTOR. I have reservations about it as a long term MMO, but as the closest we'll ever see to KOTOR 3 it's pretty darn good.
However if you do go with SWTOR do not role a Sith as your first character because whilst the Sith are amusing their starter world of Korriban sucks. Roll an Imperial Agent instead. Agents are good.