I'm no spring chicken myself but I find a keyboard far easier than a console controller.
And watching someone try and type with a PS3 controller is painful.
MMOs as a genre are not just an interaction between you and the computer - which controllers cope with quite well - but an interaction with other people. That requires typing.
The other point of course is that unless you wanted to get into the manual gymnastics of multiple button combos the number of abilities available in any MMO I've played would have you scrolling the bar to choose one. And that would get you or someone else dead quite fast. Purists will tell you that keybinds are the fastest most accurate way to play and just because I'm not able to play that way doesn't mean they are wrong.
If you are dead set against keyboards there are some devices from people like Logitech and Razer that give you a gamepad with large numbers of buttons under your hand. Personally I've never got the hang of them either but like I say, I'm old