I use ER diagrams, Sequence diagrams, State machines, Use case diagrams etc during planning design stages and find it really helpful to capture business process

I use ER diagrams, Sequence diagrams, State machines, Use case diagrams etc during planning design stages and find it really helpful to capture business processes / requirements and turn those down to a rough design. Except trivial cases (of which I admit we have plenty) thinking before piling up code has great value. What did die is insane approach preached by fanatics in Rational. Now we have the same situation with Agile / SCRUM. I hope this abomination (the way it is being forced down everyone's throat) suffer the same fate. The other related subjects are / were - everything has to be, OOP, OOP sucks, let everything be pure functions and other crap like this. Luckily I've avoided all the propaganda and sticking to "the only true religion" never mind that new new one would come out every other year