I think the important point isn't to compare our situations currently to 'Wage Slavery' but to acknowledge the history.
As a people, we have descended from serfs, slaves, and wage slaves. Wage slavery was a competing strategy for emerging industrialists, and a much more efficient one since they did not have to feed and house their wage slaves the way Chattel slave owners had to. ( Indeed, this was the argument the Southern slave owners used in favor of Slavery in the south. At least they took care of their property. The northern industrialists did not.)
So, we have descended from wage slaves. And the only reason we are much better off is because of the sacrifices made by other wage slaves who organized to fight for better working conditions.
Things like, you know.. the weekend, the 8 hour day, holidays.