Workman vs. Colemak probably isn't a huge gain. However, either of those have a huge advantage over Dvorak for someone who doesn't already know Dvorak and know

Workman vs. Colemak probably isn't a huge gain. However, either of those have a huge advantage over Dvorak for someone who doesn't already know Dvorak and knows Qwerty, because they're just not that different from Qwerty the way Dvorak is. They also preserve the left-hand location of C, V, and X since those are so commonly used for cut-and-paste operations. Again, this is coming from someone who's proficient in Dvorak, but not Colemak or Workman, but right now I would not recommend Dvorak to someone interested in trying an alternate layout; I'd point them to these newer alternatives instead.