With trust level of "Regular", you get access to the Lounge, which is pretty much silent. You are not missing anything. There aren't to many people there. It just basically means that you post here way to much and seem to contribute to the community. The following is in the Lounge, which is inaccessible, but I'll add the Discourse forum explanation here:
Regulars are the most active readers and reliable contributors over long periods of time.
They can get to trust level 3 by...
This is time and activity based, unlike the previous levels. In the last 100 days...
must have visited at least 50% of days
must have replied to at least 10 different topics
of topics created in the last 100 days, must have viewed 25% (capped at 500)
of posts created in the last 100 days, must have read 25% (capped at 20k)
must have received 20 likes, and given 30 likes.*
must not have received more than 5 spam or offensive flags (with unique posts and unique users for each, confirmed by a moderator)
must not have been suspended
* These likes must be across a minimum number of different users (1/5 the number), across a minimum number of different days (1/4 the number). Likes cannot be from PMs.