I can't remember how the old one worked but I think it didn't have a save button and you could just tap outside the UI to save it? Also, maybe the change was implemented a few versions back and I haven't noticed.
Personally, I prefer the old, simpler one. The current UI has a form auto-full feature that I'm not sure I'll use. At first I typed in my note and then tapped outside the prompt and the thing disappeared and didn't save. Not a big deal since it was just two letters. But I didn't expect the prompt to close since the field had input and my tap was intended to minimize the auto-fill dialogue as it was covering the save button.
I'm curious what other people think about the new UI.