The low fat craze has dominated cooking, or at least cookbooks, for the last 20 or so years. But let me share a little tip with you all that I think is helpful to keep in mind.
Most of the low fat versions of your favorite dishes, cookies, sauces etc. pale in comparison to the original. They just make you want the real thing. So instead of seeking out low-fat versions, consider just eating less high fat foods, and eating them in moderation when you do.
There is nothing wrong with eating a little hollandaise now and then. Just don't do it every week, and don't drown your eggs in sauce. You will be more satisfied this way and achieve the same results.