I'd like to say something spiritual or inspirational, but although those things ARE really the best things about coaching from the big picture view, they are not what makes your adrenalin rush and keeps you on the job [wasn't for me anyway].
People have semi-permanent "experiences" which are built into the day-to-day of their existence and they have WOW experiences which explode into their lives. The "best" hit-and-run WOWs are when the team just comes together like a magickal animal and Oh Boy WHOEEEE!!! TRY TO BEAT US NOW!! This doesn't go on all game long. nor obviously all season long, but when it happens.... I have found that during these "moments" I haven't thought of myself once. I'm part of something bigger than me by plenty, and "we/It" are rolling and competing and if the opponent is good --- it becomes life inside a legend. Hard to describe that rush unless you've been there.
There's a second thing that's almost as good. This is on the semi-permanent side. You've got to love the game. If you do, participating in the game [yes, just as much coaching as playing] is a "chronic" pleasure. You WANT to come to the practice court every day. You want to step away from the nastiness of the world which is relatively uncaring and unforgiving, and into this privileged bubble of The Game. This is the bubble wherein if you're any good as a coach, you make it come alive. You make it tough love, but you make it fun. The Game is Alive in all its aspects --- outside reality often does not seem so.
It is a temptation, it is so alive. It is a temptation never to leave The Game and face the true often-grinding reality which allows it to exist at all. Old ballers and old coaches often cannot adjust when their time is done. Damm near nothing is as Alive as The Game.
