I think a lot of people play D&D for the opportunity to self-insert into a fantasy world and be a hero or other sort of badass. I know I do! It's a fun way to explore your creative side and build interesting characters through actions that have lasting consequences. Good groups feel more like collaborative storytelling - to the point where many authors often lend from campaign events in their writing.

For those that don't like face-to-face groups (or mouth-words in general), I'd highly recommend looking up online MUDs (multi-user-dimensions). They can be a lot like the D&D experience, where you're prompted to act through being given 'descriptions' of what's happening around you. The world's always there too - so there's no need to wait for a Dungeon Master or group in order to play!

Good MUDs also let players leave marks in the world's history and make a lasting name for themselves. It's something I definitely hope to get right in the MUD I'm building. :)