as a daily-cane user, i can definitely say, use a wheelchair or ECV in WDW!!! I have had a cane or crutches daily for about a year, and I could not have made it without my wheelchair.
unless you have a specific reason why you cannot use an ECV/wheelchair (i.e. broken tailbone so you can't sit - but then i dont know how you would sit on rides!) then they will tell you to use a wheelchair. you will not get to skip the lines with a cane...
i would suggest getting a folding cane, which you can pull out when needed - it was great for me, but again, i would never have been able to do it without my wheelchair!