I don't remember being taught any rhymes, and I do my 5 all in one go starting from the top right. It doesn't look like an S because I draw the right angle clearly. Seems like a waste of effort to go putting a hat on.
Speaking of wasted effort, I remember teaching myself to put an extra line across the middle of my 7s at some point in early secondary school because some other girls did that and I thought it looked smart. I've no idea why and it seems totally pointless if the 7's hat is long and flat enough, and the side slopy enough, to clearly distinguish it from a 1, but I still cross them automatically.