I almost always do online check in. The airline I use most often has self bag drop, it usually takes me two minuts to drop my bag.
Business class luggage comes out first? I mean, if it does, the rest comes 3 minutes later.
You can pay for a lounge, its not that expensive. I did it once when I was stuck in an airport for a long time since I missed a flight. (long story...I couldn't leave the airport). The lounge had reclining seats so I was able to sleep. Otherwise I never get to an airport long enough before a flight that its worth the money.
You can also pay for fast track security.
All for less than a business class ticket.
I met an actual billionaire once who said he never pays for business or first class, he just takes a sleeping pill when he gets on a plane and it doesn't matter where he is sitting.
I have started doing that on night flights and its life changing.
Having said that, for a really really long flight I might be willing to pay a few hundred for a business class seat, but not more than a thousand.