After five books with one publisher, I was comfortable with her editing style and preferences. It made submissions easier. I knew she prefered the newspaper hierarchy of quotation marks for conversation rather than the traditional one espoused by Fowler, changed all semi-colons to commas, and the areas she considered off-bounds for category romance. I was familiar to her too and we both benefited.
I've just received the first edit from NCP and my writing environment has changed. It's too soon to say more than that, but it is different and I have a new set of preferences to learn. It's a little like changing the language settings in a word processor.
Another four books and this new relationship will be just as comfortable as the other and I will have broadened my skills a little more.
It's the great thing about writing. You never stop learning.