Nettles are indeed wildlife friendly, especially the stinging nettle -
Urtica dioica.
Not as a direct food source, but the presence of the stings has allowed the relationship with numerous insect species to develop.
The stinging hairs of the nettle developed as a defence against grazing animals. So effective are they that few grazers, with the exception of goats and hungry sheep (which you won't have in your average garden), will touch nettles when the stings are active.
So, nettles provide long-term shelter for insects, such as aphids and caterpillars of many butterflies and moths, as they can also move between the spines without activating the sting. The insects, in turn, provide food for small birds, such as tits.
Having said that though, because nettles are so prolific (being native to Europe, Africa, Asia, and North America) I think there are enough nettle patches around to provide a suitable habitat for wildlife, so I wouldn't be depriving them of it by not having them in my garden