It still happens to me. For the big bosses you can usually hang back for a few seconds and swap out a set of weapons for a ranged option and then engage. I usually take on Teq daily as well and on the occasion when I try to get into melee range, even with my Mirage which has enough evasion to dodge sunlight, I still wind up having to WP a couple of times as well, before I give up my dillusions and go to my ranged weapon.I'm currently on exotic berserker gear, working on crafting ascended, and I'm mostly copying an online build. I feel my issues are more player skill failure on my part. When I try to melee against some boss enemies I end up knocked down at their feet often soon to be dead in a AoE field I failed to recognise and when I go ranged then we'll all be dead with "use cc..." in chat. Although he doesn't have the CC bar which is causing my dilemma, today's Tequatl was a personal failure to my melee skills and I had to WP twice in the first phase.
For a profession like the Warrior which is even more melee oriented it's probably a better idea to go to the boats and defend the turrets. Map meta bosses do a ton of damage by design. I suppose if you had a raid team around you might be able to face tank it's damage, but you're not going to find that in open world boss fights. I usually take classes that are ranged, Hammer Herald, Shortbow Renegade, Greatsword Chrono. I do occasionally bring my Weaver, but I make a point of going with the Staff instead of the usual Sword/Dagger.