I exclusively use a trackpad for all my computing, laptop and desktop work and personal. I absolutely love it, and maybe I’m just used to it/grew up with it but I am so much faster on a trackpad than a mouse. All the gestures, the ability to drag things around easily, and not having to move my arm around are great.
That said, I do struggle with the Magic Trackpad in terms of where to place it. On the sides of the keyboard feel awkward, and I’m used to having modifier keys at my reach so I usually end up placing it below my keyboard to emulate a laptop but then the slanted nature of the trackpad is awkward when typing as it’s taller than my keyboard.
So these days I usually just end up using my built in MacBook’s keyboard and trackpad in a vertical setup with my external monitor and it’s honestly the best solution I’ve come up with so far.