Yes, weight does make a difference. If you have the opportunity paddle around for an hour with a basic heavy paddle, then switch over to a carbon fiber lightweight paddle. The difference is just insane even though we’re only talking about a few ounces. Also look at the math:
37 ounces for a basic paddle vs 23 ounces for a high end paddle = 14 ounces extra per stroke
If you’re out fishing I’d estimate you’re paddling somewhere around 3 miles (estimate 500 strokes per mile)
11 (ounces) x 500 (strokes) x 3 (miles) = 21000 ounces = 1312 extra lbs of swing weight
That’s a lot of extra weight! And yes, I guarantee you will feel it the next day.