Do You Write Out of Sequence?

Writing in sequence........it's how I write but I am wondering if this serves me best. Reading the comments on my last post it seems most of you write out of sequence. The thought fills me with great fear.......what if I can't go back in time and have huge gaping holes in my story? What if all I end up with is just a group of unconnected scenes? Could I bare to go back writing the connecting and less griping bits? I can see the nightmare swirling in front of me.

However I know that my pacing is too even in my last work and writing out of sequence may just solve that problem. Do I dare take the plunge or shall I remain in my comfort zone of careful even pacing through to the end of the story????