I'm also a numpad fan, and wouldn't have a keyboard without one.
Aside from making it much faster to enter numbers, I also really like it for gaming - instead of using WASD, I use the numpad 4,8,6,2). This means a whole bunch of other keys are right there for use by the same hand, e.g. 7/9 for jump, "/" for throw, 1 for crouch, 3 for prone etc. I realise this is controversial tho!
Aside from making it much faster to enter numbers, I also really like it for gaming - instead of using WASD, I use the numpad 4,8,6,2). This means a whole bunch of other keys are right there for use by the same hand, e.g. 7/9 for jump, "/" for throw, 1 for crouch, 3 for prone etc. I realise this is controversial tho!