It's probably worth noting that of course this isn't saying that there won't be some desires which will take a lot of effort to obtain but also which will lead to great bodily or mental pain if they are not achieved. Those desires aren't the result of empty imaginings, but of real factors, and in those cases, it will make sense to exert great effort to obtain them.
So the point isn't "it's ok to be a slug and always avoid desires which take a lot of effort." The point is that before you put in a lot of effort to pursue a desire, be sure the goal is one that you really will feel the absence of if you don't pursue it.