I think that both traditional art and digital art require a level of skill that, whether you do one or the other, requires lots of practice and patience to learn how to do it and make a nice piece.
I dabble in both digital and traditional. I find that with digital, a lot of it is memorization. It takes time to learn which function does what and how each component in a program works. And on top of that, you then have to learn how each part can go together to make a cool effect. Like in Photoshop, when drawing anime/manga-styled, some people choose to shade their hair by drawing a line of color and then smudging/blending it, while other people use gradients (and then the rest do all sorts of other things). Both can achieve a cool looking effect. So even though it is on the computer and certain tools are used to do certain things, depending on how you combine them, you can get different effects, much like traditional art. Different tools can used to create different effects, but most people figure these out from tutorials, experimenting, etc.
When creating a white spot in an eye or a shiny part of an outfit or something, some people dab white paint or use white-out or a white gel-pen. Other people just leave the paper white and are super sure to just draw/color around it. Traditional art is much like digital art in this way that it is all about technique. It takes awhile to learn, takes experimentation, directions, etc.
In that sense, both take a relatively equal amount of skill and practice to learn to create good images. It takes a long time to get good with Prismacolor pencils as it does to get good making vectors.
But in a different context, drawing itself is totally different. If you cannot draw a person with correct proportions on paper, chances are, you cannot do it on a computer. Having a fancy-dandy program will not give you the ability to do something that you yourself do not know. People who do strictly digital drawings, that's all fine and cool. But they too had to learn the basics of proportion, shading, design, etc. It just takes a different skill to learn to recreate it on Photoshop than it takes to do it with colored pencils.
Lots of artists who aren't exactly amazing who work with digital art complain that their images aren't good because they don't have Photoshop/Illustrator/Whatever. For the most part, that's not true. Like Arch said, there's no magic "Art Button".
But this is all in relation to 2D drawings, paintings, etc. As far as sculptures and 3D art goes with Blender and such, I've got no idea how those compare to each other. But I figure it's roughly the same idea. If you don't know the basics and how-to behind it, I don't think you can recreate it digitally (or traditionally).
I feel like I strayed from the main topic. xD Overall, I like both traditional art and digital art equally. I just like what looks pretty... and preferably didn't use a template (digital 'artists', I'm thinking of you >>;; )
