My first 1st class trip was when I was 3 months old and my most recent was last month. My uncle was a pilot for Delta and my grandfather helped to start the company so we always got upgraded for free because no one else was in 1st, lol.
Then I worked for Sprint and with an AMEX upgrade paid $25 per leg and they doubled (or tripled) mileage. Then another company I worked for paid for 1st on any flight over 2 hours. You get spoiled
I don't mind flying with someone in coach but when I'm by myself I try to go 1st unless it's a short trip.
1st international is the best by far. Today's 1st domestic is worse than coach USED to be. Being able to cancel is the best. When I got sick recently my brother was able to cancel 2 of my planned trips for me at zero cost.
The best 1st class prices are to be had when there's heavy competition. First from ATL to LAS is just a little more than coach. In fact, when I made a decision to go to Vegas at the spur of the moment several years ago I paid double what first goes for now and got a coach ticket.