The answer is no. You used to be able to basically perma-block, but now you can't because you don't regenerate stamina while blocking. You need to time your blocks for when the thing you're holding aggro on is winding up for a big attack (although depending on the attack you'll either block or get out of the way - it will take experience to learn when you need to do one vs. the other), or when you've got a ton of mobs on you (which shouldn't last long if your DPS are doing their job and burning them down).

I never played WoW so I can't really compare tanking in ESO to tanking in WoW, but the keys to tanking in ESO are taunting the right targets (priority goes bosses, melee heavy hitters, anything else you can easily grab without losing aggro on the higher priority stuff), making sure your positioning is right (try to keep the stuff you're holding aggro on away from your friends while staying close enough to be targeted by heals, get out of red AoEs, and for certain boss mechanics try to pull the boss to a certain place/facing), throwing down some crowd control on mobs (where possible - some classes have an easier time with this than others), knowing when to block (already mentioned above), resource management (depending on your class/build this may be mostly about stamina, or it may involve magicka management too), doing whatever you can to make the healer's job easier (use damage mitigation abilities, damage shields, self-heals, etc), and contributing some DPS while you do it.

Easy!

Actually, I find tanking in ESO to be a fun challenge. More so than the other roles IMO.