Planning vs Pantsing

[hils]

So, I have my topic for this years writerconuk. Thanks to sinnerforhire for the idea

planning vs. 'pantsing' (e.g. flying by the seat of your pants)

I could really use some input from the writers on my flist so I can put together some discussion points.

Do you write plans for your fics before you start them? How much detail do you put into it if so?

For those who don't plan do you think it benefits your story? If so how?

For those who plan do you find it inhibiting in any way? Are there disadvantages to it?

For those who don't plan do you wish you did?

Planners: Any advice to pantsters who want to start planning?

Have it it folks? Anything and everything on the subject is welcome. I could waffle on about my own experiences but I might save that for the panel ;)