Would this 'collapsing' feature be useful on MSE?

In the case where one wants to answer a question using a number of propositions and lemmas with proofs, I think one can organize it better with this feature on Wikipedia for hiding proofs. The link shows how the proof of the integrability condition is hidden thus giving the section a sense of better organization with the show, hide buttons.

I think it will be a useful feature on MSE as one can

• Organize one's answer/question better.
• Make long responses appear shorter.

Other users may find other advantages of this feature but this is all I can think of.

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cool idea ${ }$ ${ }$ ${ }$ –  draks ... Nov 27 '12 at 7:45
I am adding link to the current revision of the Wikipedia article - just in case it changes in the future. BTW similar feature is available in many internet fora (phpBB-based and similar). –  Martin Sleziak Nov 27 '12 at 8:03
I searched whether there were similar feature requests at meta.SO and I was able to find these: Long code in question: Adding a hide/display button and Toggle / collapse images and other parts. –  Martin Sleziak Nov 27 '12 at 8:09
It was just pointed out to me that I started the same discussion on Physics: meta.physics.stackexchange.com/questions/2754/… –  tpg2114 Dec 10 '12 at 0:42