Another effect we noticed is that when we were in the Bahamas, the Catalina owners doing the southward trek had all "found" each other by the time we reached Hope Town and had started mostly cruising together -- so in one anchorage there might be no Catalinas, but when you catch up to the troupe, you'd be cruising along with five. They like their boats, and most cruisers are gregarious and tend to group together for safety and convenience -- and because the weather windows enhance that effect, naturally.
Weather windows effect: By the time we all left Rum Cay after a front had passed through, there were twelve boats in the procession starting out for points south! IIRC about four of them were the 36'-range Catalinas, and that's a good month or more after the initial group-up in Hope Town (and past Georgetown, which one might think of as the First Turnaround for snowbirds who will be heading back to the northern areas for the summer months -- so, many of these Catalinas were heading farther south). As it happened, our best cruising buddies were on one of the Catalinas, and we were in a 36' monohull at the time, so it was also convenient and fun to sail along hitting the same anchorages.
This time we are going to be catamaran people, but given our tendency to want to explore anchorages, that extra speed is a good thing, we may catch up to monohull sailors who are pressing on to get south -- and reunions down-path are just as much fun as meeting wonderful fellow cruisers the first time around!