JiffyPopTart
Bree-Yark
You lost charge (without feats) and 5' step so it's a little yes and a little no.we got "spring attack" and "shoot on the run" feats from 3E for free in 5E.
That alone is a HUGE boost to mobility. It should not come with no risk at all.
I miss the 5' step most of all as it let the stand and hack characters have something to do with their move even in a tight scrum.
What's missing most of all that affects melee mobility is the lack of reasons (i.e. small bonuses like flanking or high ground) to bother moving.