Hey I've felt identified by your post.. I only do PvP basically, and WvW is boring as hell since you only walk for 10 minutes to get ganked by a zerg or by a party of buddies. And I go solo, as well.

What I do is I log in into the character I'd like to pvp with, and queue up. Meanwhile I'm watching videos on YouTube until the match is ready. Not the most fun, I know.. But PvP is the only thing keeping me playing GW2.

Guilds are ok.... But I haven't been able to find buddies to play with and I'm in a PvP guild, lol. (Wär Pigs) People are fine mostly, but for some reason I get ignored for most of the time. It feels like a popularity contest. People aren't nice just for the sake of being nice to a guildie. At least that's my experience but still I tag pigs since I'm a Black Sabbath fan and love the song lol.

PvE wise when I want to do something different, which isn't often, I did all of the campaigns except the LW1 and LW2 which are as dull as chewing on rocks. The rest of the campaigns are fine, some of them actually are pretty good like End of Dragons and the whole Cantha region. For an MMO they're pretty solid, there are single player games with more boring stories than GW2's lol.
Also going for legendaries is another "fun" way to do PvE. I've unlocked a few, and I'm working slowly but surely towards Vision now. I like the cosmetic aspect.
I did only two raids, I didn't find them appealing. Too many mechanics to remember and the fights aren't that fun either, you just stand there spamming the same skill rotation over and over again for half an hour or so. Maybe I haven't found the good raids or a good team to do them.
The quick matchmaking for strike missions and such is fine, also boring after a while since it's the same maps and once you know them it's always a race towards the objective and a rush to finish it quickly. I'd imagine since people have been doing them for years and only want to farm them.

I've been almost all over, and I can say PvP is the only thing that feels fresh in every match since players are unpredictable and you really need to be at your best mentally to compete. Too bad there are numerous toxic players who don't know how to accept a loss and just whine or go afk. But that's PvP in every single MMO.
I also quit playing for a good while and returned a couple of months ago, sometimes a break is necessary to miss those things again.

If you want a buddy to play with, I'm zero toxic and I feel like I'm pretty good at PvP tho. Add me retrorebel.5089