I still play OSRS pretty regularly, typically in 2 month intervals. I started playing RS3 in 2006 but jumped ship shortly after OSRS came out, it just doesn't feel like the same game anymore. Kind of degraded into a cheap WoW clone. The removal of the wilderness really hurt that game's player base, but completely changing the combat really did it in. Pay to win microtransactions didn't help either.
Other than that, I played WoW for about a month when the Lich King expansion came out. I thoroughly enjoyed it, but couldn't afford to keep paying for membership at the time. If I can ever remember my old login info I might check it out again sometime.