I was always alone in Fallout 3 (had dogmeat with me at one stage), but in NV I had two with me all the time, and that was not balanced really.
For Fallout 4 I wanted to stick with Dogmeat, mostly because I never got over it losing him in the cathedral in Fallout 1 16 years ago. Then I saw the leaks and I am not 100% happy with the animations, which I can live with, but when he fell down that skyscraqer that really killed my immersion somehow, so I might go alone for the first couple of hours.
As for the others, I just do not put enough faith in Bethesda's talent for characters shaping. From all companions in Fallout 3 there was only Fawkes that I was interested in, the rest was boring to me. Fawkes had some meaning for the main quest so this worked in his favour as well. I believe Preston and Piper will fall into the same category as Star Paladin Cross, Charon and Jericho.