Do you mean that you aren't coaster or "big ride" people or that you don't ride any rides at all?
Some of our (DH &I) favorite things to do at MK are Peter Pan, Buzz Lightyear, Winnie the Pooh, Pirates and Haunted Mansion. We like to stroll around liesurely, browse the shops, ride the TTA and Train, sit on a bench and "people watch". Have ice cream for dinner if we want to. Go to Crystal Palace for a character breakfast. Watch Wishes at night. It is a totally different way to see and experience everything when it's "just adults". No rushing from place to place, no worries, just pleasing yourselves. Hope you have a great trip!