No, you are not the only one.
I now find Slimfast too high in sugar except for the low carb version but when I used to use it, I also enjoyed making healthy shakes with it that were delicious and filling. They just had too much sugar.
I just buy unsweetened protein powder now and do the same thing, but I have to agree it doesn't taste as good. I love the taste of Slimfast.
There was a little bistro across the street from a place I worked once that made Slimfast shakes and also ice cream special items and people bought them like hotcakes, very good.