I'm a software developer and there are many times I have to wait for something (a program execution to finish, clarification about a task, etc.) and thus have time to open tabs for lemmy and other non-work-related websites.
I might not meet your criteria though because I don't usually create "several new posts daily" nor do I comment anywhere near on all threads I read (because I don't comment where I don't feel I have anything useful to add).