Well with tank/healer you'll have instant queues for everything so that's nice.
The game uses a quest leveling system with a main story quest and some/a lot of sidequests. The main story unlocks most features in the game so it's necessary to do it, and contains a bunch of mandatory dungeons to clear, so having fast queues is good. The downside I'd say currently is the vanilla part of the game is old and in dire need of shortening and reworks. There's a lot of boring fetch quests all throughout the vanilla MSQ and it's not very interesting until it gets near the end. Then there's an insane amount of quests at old 50 cap to progress into the expansion areas that are really tedious. There's also one notorious dungeon at the end of the 2.0 MSQ that has cutscenes inside the dungeon, so generally everyone else will keep clearing the dungeon while new players sit there watching cutscenes after cutscenes without seeing the bosses or anything, it's just poorly designed.
That said, once you power through this pretty shitty part, it gets a lot better. Heavensward(1st expansion) MSQ is a lot better written and has a lot less garbage around it, the dungeons are better, the zones are prettier, the skills are nicer and so on. Similarily at the end of that there's a bunch of quests from the 60cap before Stormblood(current expansion) but again they're better and a lot more interesting overall.
Combat is slower than WoW with a GCD of 2.5secs, shortened to 2secs for some melee classes. Overall it plays fairly different than wow, even though it uses the same concepts.
I'd recommend checking the trial first. It goes up to lvl 30 now which is a fair amount, if you hate the game at 30, you might like it later but not guaranteed, and if you like it enough you can just buy the game then. 30 doesn't take very long mind you, especially if you pick a preferred server(servers with lower pops, they currently have incentive for playing on them, you get 15days of free subs if you reach 30 on them and you have 100% bonus xp until 60 letting you skip most of the sidequests shit. 15days sub only works if you have an actual sub, won't give you 15days of sub on a trial account but will add them once you upgrade).