Has anyone else gotten the same feel?

Yes. Oftentimes people who played lots of games will describe the feeling as "leveling up," and it's a normal and desirable part of growth. This quote is relevant: it's important to not say "well, I've leveled up, no more growth necessary!", but instead always be on the lookout for the way to get to the next level. But the path that got you from level n-1 to n and the path that gets you from level n to level n+1 may be very different, and the restlessness that comes with feeling like you know this stuff is useful for getting you to look elsewhere.

(I'm not saying that you're "done with LW," but I do think you're "done with lurking" and I think that you've done the right thing by registering; it makes for different kinds of interaction, which leads to different kinds of learning.)