Hm. I looked around while I was blanking my posts and comments and I feel there's a lot more "activity" in some subreddits, but it feels bot driven. Many of the accounts I looked at were relatively new, like less than a year old. Maybe they were real users, but it certainly didn't feel like it to me.
I feel the same way. A ton of the top front page posts are just repeated slightly changed comments by less than a year old accounts with almost no posts or karma. It's a very weird vibe over there right now and I'm pretty sure even though activity is up... human activity is dramatically down except for smaller subs (which seem to have unique content with not a lot of bot activity).