In a casual look they do have a bit of the Spring/Summer season but I think that the proper pair worn with care, usually in a smart look, can work all year round.
In terms of product picks, I'm fond of these Topman/Marc Hares, although be wary of quality:
And these from Gucci (the ultimate loafers brand):
And a great casual alternative is, I think, the driving shoe, as exemplified by, um, Car Shoe:
So yes, I'm firmly a fan of loafers. I should probably buy some