Alignments? I do them after every serious off-road excursion. but to be honest, yes. Those that buy the "lifetime" alignments get their money's worth, but usually end up with a boob who can't figure how to align things to being with.

As for the sway bar, I'll be honesty with you. At first, I ran with it and climbed under the GV to remove it each and every time I wheeled. Frankly, that SUCKS.
Then I got one of the very few Rotational Dynamics sway bar quick disconnects, same as for the Sidekick and Sammy. Only problem is, the GV's bar is trailing the axle, which meant I still had to climb under to disconnect it by pulling the pin, same to connect it. That sucked less, but still SUCKED.
Finally, I pulled the pin and left it out (it was raining hard after a trail ride and I wasn't going to lie in the mud). Never looked back after a couple weeks of driving it into NYC for work. I prefer the ride without it, much more compliant, and no real body roll to speak of, and I've got a Calmini 2.5" plus the Calmini 3" B/L on 31"s, so I'm way tall. The quick disco pin still sits in the center console.
Is it as "tight" without it as with it? No, but the GV rode like a board to begin with, and never has a soft ride. But do what you feel comfortable with. Drive with it and without and you be the judge.