On our recent trip both to and from Orlando we pulled A55-60... When we boarded the plane, there were plenty of seats still available, although I'd say the front half of the plane was getting filled... we chose farther back on the plane..
I'd say you shouldn't have any problem at all...just make sure you line up when they call your group...I think they usually say A-1-30 first... people can be a little pushy about boarding...Have fun!