I have this same problem with dovetails. I don't cut dovetails often enough that I retain muscle memory and top-of-mind feel for what I am doing and I find it very annoying to spend time practicing every time I want to. I was facing exactly that issue as I prepared to make the drawers for the Stickley sideboard.
By coincidence, YouTube recommended a video to me about a new dovetail guide. It looked intriguing and is only $35, so I decided to give it a try. When it arrived, I decided to cut a quick practice joint to get a feel for it and, to my surprise, it came out great. This is straight off the saw and as close to a 5 minute dovetail as I'll ever get.
The guide is made from urethane (like skateboard wheels etc.) and has two embedded magnets on each side. There is one side for tails, two for pins and one for right angle cuts.
It is extremely fast to cut dovetails this way because all you do is mark the baseline and add some tick marks on the top for the layout. As you can see, it is translucent and that helps to position it accurately.
I tried it with both western and Japanese saws and found the former much better. The magnets are strong enough that my Japanese saw wouldn't work without applying downward pressure on the handle.
So, is it a good idea to use a guide? Certainly if you are a beginner it is. I'm not but I still found it very useful for two reasons. It's very fast for those of us who would otherwise mark out the pins and tails. Second, if you haven't cut dovetails in a while it is a very good way to re-establish muscle memory and remember those little things that make a difference. I found myself sawing with a very light touch. If you are cutting a lot of dovetails I think you could use this for awhile and then cut the rest by hand. I am not bothered by using a guide and I think I will keep using it.
The guide doesn't work for half-blind pins but I still found it useful for making the drawers because you can cut out the tails very quickly and precisely and, of course, you can use it for the dovetails on the rear of the drawer. They came out well: