Standard English proverb for "When you see a useful resource, you feel lazy to work."
This proverb (collected in Illinois) from Mieder, Kingsbury & Harder, A Dictionary of American Proverbs (1992) seems somewhat related:
No man does as much work today as he is going to do tomorrow.
As does this one (collected in Maryland) from the same reference:
Too light for heavy work, and too heavy for light work.
Neiher of these proverbs is particularly widespread, however, as far as I know.