What do you use your 70-200 f4 IS lens for?

So I have a strange situation where my least used lens is the 70-200mm IS lens. For travel I mostly use the 24-105, 50 1.4 and the 100 f2. For wildlife I use the 100-400. For portraits I use the 100 f2 most of the time and sometimes the 50 1.4. The result is that even when I travel with the 70-200, I rarely use it. It's long, white and calls attention; so I find it to be a pretty uncomfortable travel lens. Due to lack of use I'm considering selling it. Am I being unimaginative with this lens? What do you use it for?

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Canon 5D, Canon 50D, Canon 100 f2, Canon 100-400 IS, Canon 50 1.4, Canon 24-105mm IS, Canon 70-200mm f4 IS, Tamron Pro 1.4TC, Speedlite 430EX, Feisol 3402 + Giotto ballhead.