I don't like to wait in Standby, so I always get fastpass even if it's only to saves 5 minutes. Fastpass is just a fun thing to get, like a scavenger hunt. It gives purpose for the day at the park. However, it is an exciting, stressful way of doing WDW. People who are more patient and even tempered than me can easily enjoy waiting in a standby line that isn't excessively long. They can chat with family and admire the standby decorations, and make it a leisurely experience. It's something I can't do. I always blaze through WDW. I constantly yell at my teens to walk faster, even though I'm normally the slowest walker in the family. Sometimes I spend most of my time on a ride staring at my phone, trying to get a fastpass for the next ride. Doesn't matter which ride just as long as I get a fastpass for it. It's super exciting. I'm normally low energy, but in WDW I suddenly have more energy than all my teens combined. That's why fastpass/Genie+ is extremely important to me.