OP fits my experience, 5e just does not seem to have the big problems that need structural tinkering. I have a couple house rules - short rest is 15 minutes & no more than 3 per day, and detecting an invisible creature who doesn't take the Hide action has a default Perception DC of 20 (the actual rules here, to the extent they exist, being a total mess - just went through my PHB checking 4 different locations with snippets about 'Invisible' > 'Heavy Obscurement' > 'Blinded' - and advice which is basically 'GM decides'). But most of my 5e actual play experience has been cutting out house rules as unnecessary, rather than 3e/PF encountering major structural issues or 4e extensive tweaking with monster stats to get something that works.