On the left of the page when you log in to blogger - right at the bottom, below where it says Comments Earning etc. there *should* be a button that allows you to revert to the "legacy" version.
Hot that and (for the time being at least) you'll be able to post in the way you are used to.
No idea how long the legacy version will be supported for though.
I had to do this as the new version seemingly made you upload and add one image at a time (Gee, thanks for that Mr Blogger Genius, that's ideal for my regular 30+ image posts - what a helpful and well thought out upgrade)