Creativity is what makes a video magic in my mind. So I got 3 hours in today and never once had the program get in the way of my creativity nor technical needs. Smooth is the word, round tripping between Vegas and Samplitude, using masking and mixing formats (used several tools such as color grading and up sizing 720 to 1080P), green screened a 3D animation I had made into 4k video. Taking a break I realized how important to me the ease of editing in Vegas is, never once did I have to break my creative mood to figure out how to do something (to be fair, I use Music studio for about 5 years before I got VP13, but work flow is, for me, so intuitive and that I don't have to figure such things as plug paths.
Color grading and masking is so intuitive that mixing B&W video with color video and the masking of key elements didn't take me "out of the creative zone" , like other editors have. I am working on a 15 second intro segment and it has two sound parts, title, and two different videos. Like I have said I've done quite a few things in Vegas/Samplitude for each part and so far not a problem to be seen. In the future this intro will be mixed with h264/265 4k/5.5K video segments in nested files, a tool which I don't think I'd attempt this project without.
I guess it really depends on the individual for what is a great work flow and perhaps my muscle memory just likes Vegas, but I am not sure that I could find a NLE that works so smoothly (granted every system takes a while to get "tuned" right for smooth production) as Vegas.
And a big thank you for the smart upres FX as it does a very good job of moving 720 to 1080P and I have a lot of cam trail video to deal with.
I've been in the creative business for a long time, and I can say if someone asked me what is so great about Vegas as an editor, I'd say it just keeps out of the way of creative process and allows one to see the creative path one needs to follow in project creation.