Depending on the area, both... Some things, like solving simple algebra and simultaneous equations are done to death, get the students to understand the concept, do a few different examples and move on. I hate when students are given say 20 equations to do which are all the same rules with different numbers.

Something like differential equations, if you are plugging these into a calculator at first, you probably won't really get exactly what is going on. It requires more examples and exercises (there are a lot more different cases to give to) before a student could plug it into a calculator rather than going through the repetition of doing it by hand.

I just missed some of the newer calculator heavy course at the end of high school, my brother got it the year after I left I guess, wasn't a big fan of it by the looks of it though.