I'm still deliberating whether or not to unlock the bootloader when I get my Nexus... and I think I've decided not to.
Let's face it: rooting is for tinkerers. It's very versatile and it's a LOT of fun! But it's also a lot of work. After 2 years of rooting & ROMming my Droid, I think I'm going to take a one-phone vacation from it and just be a blissful USER.
Besides: I'll likely have Nexus for a year at the most. Then I'll pass it down and use daughter's upgrade to buy a quad or whatever next year's new shiny is.
What about you?