Patterns can we very detailed, and we can have some pattern variants that don’t differ much from each other. Even when we choose to have Large Thumbnail View in Swatches, it doesn’t really help much to distinguish these.

It’d be useful if we could do the same thing as Graphic Styles panel does — to click and hold a right mouse button to view a giant thumbnail of the clicked pattern.

The only difference would be that styles are displayed applied to the selected objects, while there is no such need for patterns — a simple square thumbnail will do.