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I think QML is very easy to get started with and you should just give it a go. It's not without its weirdness as other comments have already mentioned, and unfortunately there's still many controls that are less-than-ideal for desktop applications than their original QWidget equivalents. Using QWidgets+UIC is nice, but in my experience creates problems when you want to get fancy and custom with your design, with animations and shifting layouts and whatnot, well, especially after using QML.
I think QML is very easy to get started with and you should just give it a go. It's not without its weirdness as other comments have already mentioned, and unfortunately there's still many controls that are less-than-ideal for desktop applications than their original QWidget equivalents. Using QWidgets+UIC is nice, but in my experience creates problems when you want to get fancy and custom with your design, with animations and shifting layouts and whatnot, well, especially after using QML.