When you’re working with userforms, don’t forget about the Userform toolbar in the VBE.
It has some handy tools on there, particularly for lining up controls. Here’s a userform with four checkboxes on it.
The same form after using the Align Lefts and Make Width Same Size buttons. (This sounds like a commercial for detergent.)
In Access, you can use the Control and Shift keys in combination with the Arrow keys to move and resize controls. As far as I know, there’s nothing similar for Excel userforms. It sure would be nice, though.