[ktpsns]

Interestingly, the only persons I've ever seen doubleclicking in the web are from my parent generation (>60, >70 years old).

Also since 2015 the mobile adaption increased more and more. On mobile devices, the "double tap" concept never was very important, I think (at least not in the web context).

Therefore my feeling is that this issue is mostly a thing from the past.

Nevertheless I sometimes see forms which implement this "disable after submission" principle. Especially when it's about money, such as when booking a hotel or flight, etc.