I used to also think Survey was pointless, but I've seen The Game Mechanic on YouTube use it extensively and started to use it more often myself. Now, I don't think it compares that badly to Discipline. If you don't see barbarians nearby and have a couple scouts out especially on a larger map with lots of hills and woods, it can be very useful to have your scouts move an extra tile every so often. It's particularly useful when you're trying to hit early golden ages.
I do agree the recon class is pretty lame. For units that are never meant to come back home, not being able to upgrade outside friendly territory seems like a really big oversight. I think they should also be a little less prone to getting ambushed. Maybe extended sight range or ignoring zone of control would help.