In the late 70's, our trips started at 5 days and have progressed through the years to begin at 8 nights. We tend to push more to 11-12 nights, to me at least, have the price of going is the travel expense. Instead of 2 trips per year at 5-6 nights and double the travel expense, we do a big 11-12 night stay and only pay once for travel. We seem to be squeezing in 2 trips anyway, kids are grown and married and we're approaching our 60's and moneys alot freer now.
Disney vacations seem to lighten our load at home the mundane and stress of work and life in general and we like to alway have either a
Disney cruise or trip in the works, something to look forward to.
Back to the subject, 4-5 nights is okay to see Disney but its a go, go trip, hardly relaxing to see and do most things. We like to relax and use the ammenities at the resort, we prefer deluxe, and an eight night stay is a good beginning. Anymore days you can go or afford to tack onto this length would be very pleasurable. We never go to Sea World or Universal, no time to go there even on extended stays at Disney and everything we like is right at Disney, no need to go further. The longer the stay, the cheaper the tickets, more fun you can have, more things you can see and do and the best of all, the more relaxed stae you'll be in when returning home, not overwhelmed and beat.