For me it would be...
1. Having an annual pass for the parks and the flexability to come and go for 1 or 2 rides, a few riedes, staying all day, not going on rides at all, etc
2. The first Welcome Home on 1st trip, home... And all that have followed.
3. Tours/Excursions/Resort Ameneties - Both segway's, kttmk, fishing, parasailing, all the different pools and slides, beaches and cream (kitchen sink) at bcw, jellyrolls at bw, wispering canyone at wlv (Who's got the ketchup?), serenity of OKW, etc...
4. Going to a park for dinner or a show (without going or even wanting to go on any rides). We use to plan our meals by which park where planning on being at on a certain day. Now we plan which park and rides (if any) to go to by which restaurant we are going to...
5. Knowing we will be back again soon when the trips is coming to an end (usually have 1 or 2 trips in planning process at all times) and not rushing to squeeze in another park, activity or event.