Thus far I've noticed zero difference here in terms of it affecting my playstyle.

That extra HP makes zero difference in non-raid content if the tank is playing their job correctly (especially with the current pale expert dungeons which hit for nothing), and raiding progression is still the same formula of bosses hitting for nothing until mechanic or buster, and it's been balanced around a modern tank's HP.

What I do miss are trash packs dying faster with WAR's old DPS though.