Most likely it is the techs in my case. I tend to make haste to iron-working because of all the goodies mixed around the swords.
I find horsemen to be useful to build a few, for upgrading to knights later especially. I tend to build fewer of them than swords for the following reasons.
1) They're not quite as useful for defending (counter-attacking yes, holding ground no)
2) Not anywhere near as useful for sieges, both for defending themselves and for attacking the city. No flanking bonus + no city bonus + city penalty.
3) There's a couple anti-mounted UUs out there that an AI will have plenty of to chew up the horses more, requiring more maneuver management of armies. There is no clear "counter" unit for swords in this way unless playing against Alex.
But they're awesome at other things so I always have some. There's also plenty of situational effects, if I have a lot of horses and little iron, very flat terrain, larger/wider empire to defend, multiple fronts, etc.
@Thal, technically chariots have "changed", slightly by being buffed when the other horse units were. They were 5/8 and now 6/9. That hasn't apparently done much to give them greater appeal. More than likely the basis of not noticing a move-after-attack is from not building them very often.
