FWIW - The low gear on my Dahon Curve D3 is low enough for most hills, with me still in the seat.

I find that when I stand up to pump while pulling on the handlebars, the pedals feel flexy. I'm much more worried about a plastic pedal folding out from under me than the handlebar bearing or whatever. Not standing, it is fine, but it isn't a granny gear. Just a low one.

If your legs are ripped and/or you know how to pedal in a circular motion, you should be OK on most hills. With sturdier pedals, I wouldn't worry at all. I don't pull that much on the bars, I mostly stand up just to get some weight behind the strokes.

The advise to go to clip pedals is good, as then you can really pedal efficiently. (because you can pull up as well as push down and pull back)