The ease of double majoring/having multiple minors is depending on things like:
-Core curriculum and requirements for major at the school you attend. For example my S went to a Jesuit college with a large core and it was much harder to double major than it was at my D’s LAC which had a smaller and more flexible set of distributional requirements.
-How many credits you go into college with – as credits fro APs etc. may take care of a number of the schools distributional requirements freeing up more room for electives/second major etc…
-School policy-- ex. at my D’s LAC they only allowed students to declare one minor.
I agree that I would not stay longer at a college to double major or to take an extra minor. More important that you take the classes you are interested in, regardless of if they lead to an additional major/minor. You can always list some of the more important classes you have taken on your resume.