I'll say what I said above, there's so many extremely situational abilities that druids have, but you will kick yourself if it wasn't on your bars somewhere when you need it. Sure, 72 buttons may be unnecessary, but when I shapeshift into kitty form and dash ahead of "bad AoE", or interrupt that "bad spell" when no one else does, you'll be happy I had those on my bar. Plus, I want my caster DPS spells, in case I can through them out, any CCs, defensive CDs, healing spells or CDs should be on my bars, too. Personally I count around 40 abilities that I would like to have on my bars in some way as a resto druid, though I would probably macro a number of those together. Quite a bit less then 72? Maybe, but there are certainly many more druid abilities around you could have in there, profession cooldowns, text macros, etc.

I had some extra space at the bottom and decided to put more button bars down there. One bar is for pets, one is for mounts, another is for professions and utility macros, another is for pots, food, drinks, etc. The rest are druid abilities. I have many of them hotkeyed, but I sometimes forget the keys and it's just easier to click the button when I can't remember rather than try a bunch of keys or pull up some gui to find the ability. It may be cluttered somewhat, but it is definitely convenient.

I could probably get rid of omen, since skada has threat meters, but I've used Omen for years and I haven't been able to get rid of it. Maybe someday I'll finally say goodbye to it.