An archipelago planet, I need to get a warp-capable ship to explore it.
It will be fascinating when they can image these planets, Earth may be somewhat unique with it’s large oceans, maybe a lot of habitable planets have numerous seas instead.
“Habitable” is a subjective term anyway. We’re ideally suited to this planet but we’re also the most adaptable species to ever live on this planet and we have the added ability to control our immediate environment to a certain extent. After all, we have people living in a completely uninhabitable environment on the space station. The arctic regions of our own planet are uninhabitable without a certain degree of technology and adaptability. With a thicker oxygen/nitrogen atmosphere mars would be pretty close to habitable without protective pressurized suits.
Large global oceans are good for transporting heat around a planet but I’m not sure they’re necessary as long as there’s enough multiple seas. The great lakes regulate temperatures in the region without currents running from tropical to arctic regions.
Considering the fact that our galaxy consists of hundreds of billions of stars and it appears that the majority of them we’ve looked at have planets, I’d say that the possibilities are pretty much endless. No planet would be exactly identical but some are probably quite similar and within our ability to adapt to.