Dangerous if you have an OS like windows that will install every executable whether you want it or not - but a permission based system like Linux needs to ask every time.
Don't click on everything you see in windows, and pay attention to the install permissions elsewhere. If it sounds too good to be true, it usually is.
I can't do anything in Ubuntu without it asking for a password. Check the permissions on every app, and if you don't agree, don't install it. There is still a need for Java for some applications (don't gamers use it?) - but I've disabled it in Windows and haven't seen any detriment. (I don't game)
What is funny - Thunderbird ships with Java enabled. Mozilla did disable the version of Java that was causing problems. FX might have it open, too.
Soon as there is a replacement for it, there will be. Then a whole new set of headaches.
I'm more worried about sneaky and automatic updates. I try to find out what's being updated before I update any app. Ain't easy on mobile. If you use standard view of the browser or a computer, then all the pieces and parts of the update are visible.