Yes, I've had that one too. I have a Logitech keyboard case, but if I'm not writing long-form, I find it more comfortable to have the "bare" iPad, and tap out any shorter text. Unless I specifically disconnect the keyboard through the iOS settings panel first, I don't get the software keyboard back.

By contrast, in iOS 6, if the BT keyboard disconnected for any reason, (i.e. power-off/range) the software keyboard would instantly reappear.