I should probably state though, when we go we make it park of our first day where we don't really plan on going to anything Disney. We usually go 14 days and only have a 10 day ticket so we fill up our other days with things like DTD, Universal and Old Town. It takes quite a bit of time do to this but it's definitely worth it for us because we enjoy going to Old Town also which has a really fun and interesting night life, there's a little state-fair-like area plus $.49 small glass bottles of Pepsi.
Anyway, I'm rambling on though. My point was that it'll take quite a bit of time so if you don't have the time, I wouldn't recommend going. Also, there are towncar and taxis that can take you and save a lot of time, the Target isn't that far away.
If you do take the bus though, in September when I went it was only $1.50 per trip, they were surprisingly well kept up buses and I recommend to save time by knowing the bus schedule going there and back... you can just check the Lynx website for that.
Good luck!