Which server do you play? There are also channels u could ask people to run shit together?
Personally i avoid pugging except when it is to break boredom or feel generous to offer free rides.
In my groups mostly i do not care as people above mentioned - IF you do not hinder me-.
I can understand a "i can't find Chains of flame" quest question, but i'll get annoyed when some1 asks me where is WK, or what SC means at lvl 11...
All the extra boost for exp helps.
And although i think i am not runninng like a madman screaming xp per min xp per min i might skip optionals specially on levels 1-7 cause,
when the fucking base quest xp is 1-2k...a 5% will bring me 50-100 xp, fuck it,
i am not going to miss cap for 20 such quests meaning 1000-2000k xp when i reach 20...
my daily rolls will give me more if i am lucky, a single MM achievement will give me 10 like that ...
so i prefer to save 1 or 2mins per quest for not doing all breakables or do not save a stupid npc.
Last but not least, if u have not burned yourself with grinding yet, do NOT join such a group, it will speed things for you BUT :
a) you will become lazy
b) you will defer from the "fun" you had up till now
c) you might consider fun breaking ur previous completion time but its not the same
Value your enjoyment of the game as it is, take priority on that , and not how fast u can TR.
I would even go as far as say to not even use xp boosts if u haven't started yet, it's an addiction

Have fun and enjoy ur trip from 1 ->20(28)