Yup
I am not, and will never be "Leet" - so I still use the keyboard to move. I do use the mouse for traveling long distances on a mount and actually for diving too, but normally use the keyboard for most the game. It's more comfortable for me for side-steps, strafes, and double-taps, plus I don't have a gaming mouse.
It's worth mastering diving - there are other quests that involve it.
I kinda wonder what those "pro-jumpers" use for the precision leaps on some of those Leaps of Faith - keyboard or mouse