I checked out the [url=https://www.reddit.com/r/AutoHotkey/]/r/AutoHotkey/[/url] subreddit a few times. Like you said, people use it to ask for help here an there. Not much activity. This may change in the future but for now, I think people would be better served by going to the AutoHotkey forum or using the AutoHotkey Livechat.

I've started getting into Reddit lately, and found a lot of awesome communities there.
What are the sub-reddits you guys would really recommend to other people?

Here's some I recommend:
[url=https://www.reddit.com/r/battlestations/]/r/Battlestations[/url] - the place to post and look at clear photographs of desktop battlestation setups.
[url=https://www.reddit.com/r/AskReddit/]/r/AskReddit/[/url] - Ask other redditors stuff there about anything. Fun to read when I have nothing to do.
[url=https://www.reddit.com/r/EarthPorn/]/r/EarthPorn/[/url] - Beautiful photos of Earth's landscapes. Totally SFW
[url=https://www.reddit.com/r/itookapicture/]/r/itookapicture/[/url] - A lot of redditor submitted photographs, some SFW, some might not be. Really beautiful to see.
[url=https://www.reddit.com/r/AutoHotkey/]/r/AutoHotkey/[/url] - AutoHotkey's very own subreddit. Do check it out. It's like the Ask for Help.