Sneak Attack was never considered a problem because it gave your creature Haste anyway. Corpse Dance also gave your creature haste, but it was a bit more of an issue than Sneak Attack because of the mana commitment. Sneak Attack is one red to activate, so being able to do it on your opponent's EOT instead of your turn made little difference. Corpse Dance was a bit more abusive because it is always better to tap out on your opponents EOT than your own main phase.
Still, it's ability wasn't that much different for the cost, so it wasn't a concern. Waylay was a huge effect for the mana cost and the 3 mana untapped could prevent Status or some other enchantment.