It's not painful, the problem is that the code you write now might change in a month. With the release of 1.0 (which is less than six months IIRC), they will stabilize the syntax (but will be adding more down the line). But the libraries will still be very much in flux.

The reason things have been changing so much is mainly to get a better language now, and not have to write a 2.0 that changes everything. When you look at rust code from six months ago, things have improved greatly, so it will hopefully be worth it.