As Bobby Jones said, there is golf and competitive golf. I think there are three actually:
1) Golf.....no competition, appreciate the day and the company, and try to hit some good shots, but as said above, sometimes you try things that are low percentage for the FUN of it, not the score of it.
2) Side bets with buddies. This is most of my golf. Match play for a small Nassau or a round of cocktails. You still try some dumb stuff, but its for FUN, not for $1000. Full trash talking joke telling, etc.
3) Competitive golf. Your Club Championship, your state amateur, etc. Whatever level you are at, there is serious pressure, especially in Medal play. Also quite "fun" but also a grind, high blood pressure, the works. Some people thrive on this, others like me do it to see if I can hold up (I generally cant).
As to importance, I almost never do #1, almost always do #2, and frequently try #3.