Sod humankind, I'm pretty sure what matters to me is that all of the people I care about will more than likely be on that planet. And, you know, me! Gotta look out for number one. When we achieve FTL travel and can go from planet to planet within months let alone years, let me know and I'll start getting excited about space.

But seriously: Space is space, other planets are not space, they are other planets and if they don't have oceans, I'm calling them Not As Cool As Earth. Oceans aren't my be all and end all but Oceans In Space, so much cooler. Did you guys see that Voyager episode where there's a giant bubble of water in space? That was pretty great.

EDIT: My unusual interest/passion is clearly playing devil's advocate to everything ever.