I cast cranks a lot. I use spinning gear, but I make sure I have a big spinning reel. I like the biggest size Pflueger Trion. I run this on a 7′ medium rod with a fast action tip.
I can cast all day long with that setup. The bigger spool allows line to flow more freely, and does make a difference. I have found that casting larger cranks all day with baitcasters tend to wear my arm out much faster.
I think the biggest factor is that I don’t have to cast that hard with the longer rod and the big spool. You will however get fatigued with either set up from reeling those big cranks in all day.