2012, bought: 28-300L, 1D X, 600/4L IS II, both MkIII extenders, 600EX-RT, and $4.5K worth of RRS support gear. I'm not going to do the math. 
5 years ago, I was the same, P&S, why spend more? However, now I'm at 5D3 + 6D to go with all the glass I bought over the last 3 years. (Not to mention all the OTHER stuff of which there is a ton.) And the several other bodies over the years. Still haven't ventured into the 1D arena. Hopefully I won't get that urge!
neuro... I think I've asked this before but again, what is your quick opinion of the 28-300? Should I get one? (Journalistic shooting style, outdoor campouts, summer camp, etc.) Of course if you say yes and I get one, you are fully responsible for all my mistakes and resulting pictures, good or bad. It's all on
you dude!!

Seriously, what is that's lens' primary use for you and how do you like the push-pull, etc? Any standout issues, good or bad? Are you glad you bought it for your intended purpose? Thanks.