Well, that was anticlimactic.
It's great you got to see your LO & his/her heartbeat. I'm sorry the whole thing was so anticlimactic for you.
I remember feeling the same way after my 6 week u/s. There was a lot of anticipation and then the u/s itself was super quick. I also barely saw the heartbeat. I think docs or techs know exactly what to look for so they see it and then they're done. I think they forget that some people may need more reasurrance than others.