My sage is extremely popular with the bumble bees at the moment. It is full of flowers and is another plant that gives rich rewards for very little attention. It likes sunshine, a soil that does not stay damp (no problem with that in my sandy soil) and seemingly does not like limestone (I do not think it is that fussy as I am in a limestone area and it has not complained.) It was unaffected by the two straight weeks of sub-zero temperatures we had last winter and will stand the full sunlight of the Charente-Maritime which is very strong.
The red tailed workers are the most common visitor to the sage flowers although they have other flowers to choose from.
As far as using it as a herb, it is a flavour I do not appreciate so for me it is purely decorative and a great filler of difficult places. However, it has been valued in the past for its properties to encourage longevity. Dutch merchants could trade three chests of Chinatea against one chest of sage leaves in the seventeenth century. A sage sandwich is said to help digestion, although I cannot see myself tucking into a sage sandwich after a heavy meal. Sage tea is supposed soothe coughs and colds, combat diarrhoea and be a nerve and blood tonic.
More recent claims report sage as a mood enhancer and memory improver (http://www.nature.com/npp/journal/v31/n4/full/1300907a.html). Maybe I should start eating the leaves.
Putting its herbal and culinary properties to one side, I think that sage is a very useful perennial for difficult dry spots in the garden that might defeat tender plants and it attracts and nourishes the bees as well. I have my sage growing almost like a shrub on a sunny, dry spot on the outside fence of the garden where not much else could thrive.