If you are looking at the default front-page, then that can often seem the case.
But if you create an account (no personal details needed, just a username and password and there is no "no fake names" rule so there is no personal information needed) you can change the default selection of sub-groups and you end up with a rather useful (if still somewhat random) aggregator of interesting stuff. Those things you liked from the first few months are still there and if you select just those sub-reddits you care about. Some of the other stuff will still leak in, but not overly so.
Reddit is very large: there are almost certainly subreddits for that sort of stuff. As an example, /r/Haskell[1] is fairly technical (it is frequented by people such as dons[2] and gwern[3], and presumably they would've moved on from r/haskell if it became overly banal).
(Also, a brief googling turns up /r/startups[4], but I've got no idea of its standard of discourse.)
Now it's all lolpics, atheism, LGBT issues, drugs, anti-corporation/government etc etc.
The people who have most time to participate (Out of work, college students, etc) may not necessarily be the people you want...