With the constant specials and weekly sales, I’m in the same boat. There’s nothing really in my Wishlist that I’m desperate to get, the backlog of unplayed games gets bigger every month with Humble Monthly, I add the odd game or two to it every now and then, and I still can’t find the time to play the games I actually do want to as it is. If anything on my Wishlist is at 75%+ off I’d think about, but otherwise, meh.
To be honest, for me at least, the most interesting thing about the last few Steam Sales has been collecting the sale specific trading cards and then flogging them on the Market for a few cents.
(For those who do want a slightly easier way to track discounts and sales items, remember that SteamDB keeps a sortable sales stats page here: https://steamdb.info/sales/ - if you log in with your Steam ID you can track just your Wishlist items, and can also change the currency to ZAR.)