This is how I do it also.
My Xalek isn't very well geared, and sometimes he might die, but by that time the mobs are almost dead anyway so I take very minimal damage. Rez Xalek, hop on speeder, hop off, he's back at full health instantly.
I do the same on my Marauder.. send in Jaesa, mobs flock to her, force leap+smash = dead mobs
The only time you SHOULD need a healer companion is if A) you're not very well geared for the fights, or B) you're soloing a Heroic and you need the heals, or C) you just prefer to not heal up between fights. All 3 ways are fine, it's just a matter of personal preference.