I get excited about different laptops occasionally...and then I remember that I won't have a trackpoint if I switch to a different brand, and I get disappointed. Literally happens every few months.
I suppose a trackpoint might be useful if you really want your hands never to leave your keyboard, but generally I'm either editing text with emacs keybindings (where I don't have to use the mouse), or else I'm in a mode where having one hand off the keyboard doesn't feel at all hindering.
Maybe I could be convinced, but since they're hard to find these days and getting harder there wouldn't be much point (except to frustrate myself on the off chance I ended up loving them).
They do have a learning curve; but FWIW, I feel exact the opposite - I can achieve both lightning fast movement, AND pixel-perfect precision with the trackpoint (the latter I have never managed to consistently achieve on a trackpad).
(Note, for me, it's never a "Trackpoint vs Mouse". I'll use mouse 100% of the time when at my desk. When not at the desk though, it's "Trackpoint vs Trackpad", and for the amount of space it takes, the compromises it instills in keyboard layout and ergonomics, Trackpad never quite worked for me. On aside, I miss the potential of netbooks because a 10" screen with Trackpoint would be a formidable hyper-portable machine with today's ARM processors - but not if you need to reserve 5 inches for a trackpad :| )
And I'm ready to admit I am not an expert on it; my point is exactly that I am an expert on track point and it's awesome :-)