seems to me that Boomkins are much easier to manage *since* 4.0.1.
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Boomkin has gone from a random proc, which makes the other spell (Wrath vs Starfire) into the optimal choice.... to wanting to cast several arcane or nature spells in a row and then switching to the other.
It seems easier to manage, cast a lot of spells of this type and then a lot of the other type in cycles, than to have to switch randomly from one to the other. Especially easier to manage multiple boomkin at once.