Originally Posted by Acidity

What boarding group was on your boarding pass? That'll tell you for sure (or if you still have the boarding pass, it'll have your status on it).

That said, I totally believe your experience. I regularly see 30+ people board in group 1 on my DFW-ORD-DFW flights, so some routes are definitely very elite heavy. I haven't hit EXP yet, but when I do I still doubt I'll be in the top 10 for those flights (not that it'll matter, I've seen 7 GS preboard on a flight with 0 upgrades anyways).