I think I can answer this, and if I am wrong someone WILL correct me

NO, cranking t-bars does not stiffen the suspension.
It's the new springs that will change the comfort of drive.
There is noticeable difference in between Isuzu stock springs and OME springs. OME springs are much much beefier than stock. The ride becomes stiffer with new set up, but really doesn't loose on comfort.

For some, and I agree with it 100%, ride is actually more comfortable now, after the lift. Stock suspension is very stiff but it picks up any bump or rock on a road. Highway driving, unless pavement was absolutely perfect, was a real pain. Now I think the ride is calmer, because suspension is not so sensitive (is that the right word?)