From what I've learned from having kids in 4H and one in judging, the western pleasure classes are just that, a horse that is a pleasure to ride. Our judging coach taught that manners always placed over movement because even tho a horse wasn't the prettiest mover out of the line up, it may have demonstrated a willing and obedient attitude that was bar far the best out of the class and basically this type of horse defined the qualities sought in the perfect western pleasure horse. When you see the 'low and slow' in the WP classes, remember that manners plays a significant part in who will win, not just gait or natural movement ability alone.
As far as favorite disciplines go, everyone has their favorite and least favorite, just like clothes or candy or hairstyles. To each their own. I enjoyed being a 4H parent of a child in AQHA judging because I actually learned what the heck it was to look for and why some horses I thought should win would actually place third or fourth, so I appreciate the work and effort put in to get a horse to these levels. I too, found it rather boring - I am an endurance rider so it is hard to get me to 'stay in the fence'. But the few years I competed in WP, equitation, western riding and showmanship, I often placed in the top six but it still never won me over. But I can appreciate the effort that goes into it - it's like the opera - you love it or you don't!