True enough; it's a very different framing, but there's still love there, still passion.

I think a big difference is that Starfleet folks tend to be more intrinsically driven. Space isn't something that needs to be "made bearable" (unless you're McCoy I guess)—space is cool in its own right, tons of things to see and people to meet. But on top of that, the Federation has such a high tech level and quality of life that living on a starship is pretty luxurious.