I am 100% for horses. That would be so awesome.
What I'm picturing is a tamable horse that runs around in the wild. Once tamed, you can put a saddle on it and ride it, and it is 4x faster than walking and about 3x faster than sprinting. Also, when you find them in the wild, they spawn in different colors, and some are faster than others. Obviously, the faster ones would be harder to find.
This would provide the player with a faster way to travel on land, and in servers (especially roleplaying ones) they could remove the warps and have players ride everywhere to give a more realistic feeling.