Ssds actually last longer. Tests show 20+ years on modern ssds, which is a whole lot longer than 5 yrs of a hdd.
Along with read/write speed, don't forget access times, that's really what results in the snappiness. The faster loading can also eliminate stutter in games which load while moving around; common in large world games or where the level isn't preloaded. Although since hdd bottlenecks have been around so long most games have ways to try to prevent it. It just bothers me when I can see the lower detail model because it hasn't loaded the higher one yet which has happened a few times playing ac4 among other games.