Always do, it's stupid not to.
The reinforcement of the knowledge at the start of each flight will help recall in the event of an incident and there are some differences between fleets, sub fleets etc, e.g. location of life vest, overwing exit mechanism, door mechanism, lifevest type (single/dual gas cyclinder, tie or clips etc.)
As a regular traveller, for example, I could have a stab at the type of overwing door from briefings over the years (B738 pivots at top, opens outward, remains attached, A32x plug type, needs to be pulled in, twisted and thrown out, weight about 25kg, older 737 similar.)
As a PPL, I always took delivering the passenger safety brief seriously, as you might have to rely on the RHS pax to open the cabin door, etc.