Yes, it tend to occur, but not that often, in the texts I used at university. It always struck me as a bit pedantic really but is probably of use to someone. :)

I think you should definirely do some courses! I have the same worries about going back to do my MA as I haven't had to write an essay for ages so am going to ask for some practise essay titles or something before I start so I can practise. It is scary though!