My family will use our sun hats for walking and 1 shared umbrella for standing/sitting. The hat just gets so hot sometimes and the umbrella really helps to feel cooler. Two in our family burn in about an hour of FL sun, even with sunscreen.
If you just want it for WDW, there are a lot of cheaper options. The Coolibar ones are definitely more expensive. I use mine all of the time in the summer, plus other warm vacations. At the beach, at little league & soccer games. I have my original one from around 8 years ago and it is just starting to feel a little worn, so I got a new one for this summer (and going forward). But we'll still use the old one until it completely falls apart.