Yes, that is the way the system is designed. Actually, Windoze is the same. If you open a DOS window and run a lister, or any program that does what less does, the scroll action will be just as you described.
Lots of people who work from the command line love this action. One doesn't have to leave the keyboard to move thru the file. Wanna go down half a page, hit d. Wanna go to the top, hit g. Want to go forward a page, hit <spacebar> or f. Just a quick look at "man less" (no quotes) will increase your enjoyment ten times.