But then you get to Tattooine and beyond and you see 18 people in the whole zone. .
I'm on Tattooine atm and still had no trouble grouping. I suspect it depends if maybe you're on a light server? I usually play on Anchorhead during the day time and yesterday there was around 80+ there. I grouped up with 2 others + my companion and we did 3 heroics in one go.