I switched at the end of WotLK and fell in love immediately. My favorite part is the mobility we have and of course I really enjoy the whole feel of shield slams. I've done several of the 5-mans in WoD and the playstyle feels the same to me. The only change to my rotation was using a glyphed heroic strike instead of cleave and being on top of switching to the target that the dps randomly pick.
I felt it was still worth target switching to get a shield slam in on the bigger trash, but a well placed Thunder Clap gives you plenty of threat. If you are struggling at first try taking Shockwave, it has a slightly lower cooldown than Dragon Roar, and use it right behind TC. In time you won't need this crutch and can switch back to the recommended rotations.
I should also point out that threat isn't a huge gameplay mechanic. I keep omen up to bitch at people who have taunt on, otherwise its useless.
I tend to keybind all of my reactive skills such as movement, active migitation, and oh-sh!t buttons, but from a TPS stand point it's really only five buttons now. Shield Slam, Revenge, Devastate, Thunder Clap and Heroic Strike. Using Dragon Roar is a DPS/TPS increase but it certainly isn't required just to hold threat.
You definitely want a warrior or a monk. DK is a close third but don't have the movement you are looking for.