It changes the way you play... deal with it.
Ask those Mercs who got smashed back in 1.2 because of PvP.
It happens. Your range has changed. That's not that big of a deal, it just means adjusting to the difference and moving on... I play a PvE vanguard. It's NOT THAT BAD.
I'm sorry to disagree but IT IS THAT BAD yes... because most bosses in ops and HM FPs do massive damage @ melee range and survivability is key in such situations.
If I keep myself around the 15 ~ 20 meters range, I'll have a lot more chances to survive and leave the healer with less stress and keeping everyone alive.