I ALWAYS stop to admire the cover because I get to a certain point in the book and check if that character or scene is on the cover. Sometimes I just admire it for no reason XD
I'm a big fan of dirk gently and I have the a copy with the original cover (the dirk gently brass plate tumbling into a vortex) and I always stopped to admire it while reading
I kind of did that with Maze Runner when I re-read it. I wanted to see when the next good part is. I did that with the third book in the Mortality Doctrine series.