I have attempted that a few times when I got a few jobs to 75 myself. All I can say is that it is a massive time sink, but you get some great story out of it (not to mention random quirky rewards that may be of use later, such as the Rhinostery Certificate key item that grants you backdoor access to Toraimarai Canal).
Personally, I like doing quests myself. There are a lot of quests out there and you get some great stories out of them. It is times like that when you get random cutscenes and realize "Wow, they put a lot of time to make a good side-story."
Of course, some of the more annoying quests are the ones that you can't do on your own and people refuse to help with at all. Like the one with the Lamia and the zombie thing in the Caedarva Mire. I've asked many a party that I have merited there with to help me with that. All of them go along the lines of "If you want the quest, make a party for it". Or something along the lines of "I am not risking that", despite that we are easily hitting chain 100s roaming around. All that l33t gear and still being a wuss about it kind of makes me wonder "Do you really deserve that Byakko Haidate if you're just going to kill imps and birds with it?"
Anyway, sorry for the side rant. Quests are great and, though they take a bit of time, I enjoy them quite a bit, even if some are poor rewards (though others do get you good stuff or good equips you can sell for a lot of gil).
"I like SMN, BST, PUP, COR, and BRD the best. As SMN, I can throw avatars at a mob. As BST, I can throw monsters at a mob. As PUP, I can throw dolls at a mob. As COR, I can throw bullets at a mob. As BRD, I can throw people at a mob!" --Skyla Altairs(myself)
Altairs: Main Job: 75Summoner/37Scholar
Other Jobs: 75BRD 75SMN 75PUP 75BST 75WHM 73BLM
Phoenix Server Linkshell: TheUnusualSuspects(social); Epic(New RP LS from former members of the LightsTemplar)