I didn't use the bike so much in Soul Silver where you could set auto run, but I've found more use for it in Black since I've gotten back into breeding egg moves.
That's true because I use the bike from the Pokémon Center in Nimbasa City to the Battle Subway. And bike is very good to breed in the Castelia's bridge.
Bikes made bridges in Black and White seem like nothing. I mean if i ran across SkyArrow bridge or something, it would take me a while since my B button doesnt work all the time
I don't see why it's pointless. For one, it still makes you go places faster than the running shoes, and two, I use it to help hatch eggs. Just imagine using the b button for a couple-thousand steps.