Re: once you put half a day or a day into it, it's actually easier
That really doesn't matter. You've lost most of the potential users in the first half day.
A good user interface is inviting, uses standard elements that users already know and invites experimentation by ensuring undoing stuff is as easy as doing it. It doesn't matter how much fancy stuff your app does, if it's not easy to use and there are alternatives then most users will go somewhere else.