I use angle grinders almost daily and it's very easy to become complacent, I always treat it with respect and always unplug between disc changes!.
Same at home, I've used a hand held circular saw a few times, that thing is terrifying if you think of the consequences of it hitting a limb etc. Think being weary of using it is actually a bonus as you take more time making sure everything is as safe as can be.
I haven't used a chainsaw and more than likely never will, all the cutting/ pruning I've had to do I've found a Sawzal/ reciprocating saw more than good enough..
Even when using the wood shredder, if it ever gets clogged up I make sure the plug is removed from the socket before going anywhere near the cover!.
Same with jacking cars, I'm ott with axle stands but last thing you want is to get crushed repairing your own car, I've *******ed friends before laying under cars without properly supporting them first (even slinging wheel under the cill is better than nowt!).
I've spent a considerable amount on tools to repair our home, saying every diy'er buys rubbish is quite a poor statement really. My DeWalt Lithium combi drill was £250 10 years ago and still going strong.