I bought myself a Logitech G600 and it's amazing!

You don't need gaming mouses but it really does help. I can use all my skills with my thumb so it's quicker and you don't have to move your hand from the directional keys in instances like Titan EM where positioning is very important.

I also find myself constantly holding right click so I have complete control of my character's movement at any given time.

If you are able to afford a gaming mouse I would really advise it as it's made my playing a lot easier. Again you don't require a gaming mouse but it sure helps!