Yes, yes, gotta pay for paper too...
Printing on both sides of the paper is called duplexing, and it CAN be a pain if your printer doesn't do that automatically. I don't think there is a way in Adobe to print 1-2, 5-6, 9-10, etc... all the way through a document then put the paper back in and print 3-4, 7-8, etc....that would be hand if you were trying to print 4 pages per page without a LOT of hassle.
I am fortunate in that my job is to work on $3000 color laser printers all day, so in order to do my job I have to do a stack of test prints. A LOT of those test prints end up being PDF files that I take home and read and store like a packrat.
DS