Sorry if this is another "What are Druids like in Legion"... but what are Druids like in Legion?

It has been some time since I played WoW but I am giving it another go.
What's the deal now with gear/stats/gems/enchants for each spec, will I need lots of bag space for different sets of gear on my Druid?

If it helps I intend to be casual, so levelling, small groups and maybe a dungeon or 2, so I would expect to play each spec so will need ok gear to play to a satisfactory level.

Thanks in advance for any replies.