Definitely worth it. Makes loading and parking the bike far easier. I'm not a weight weenie at all - this bike isn't for that, and at 11.5kg without rack or bags (or stand), it's not light enough that adding a 500g kickstand is going to be at all noticeable.

Bike is still reasonably quick in this commuter guise regardless - I average over 28km/h on it most days on a 35-45km daily commute round trip.