No, vi's / or ? isn't incremental. This was one of the significant differences between vi and Emacs in the 01980s and 90s, when "vi vs. Emacs" was a thing. Vim added incremental search as one of its enhancements over vi as an option sometime in the 90s and made it the default much more recently, maybe in the last 15 years.

I believe I did have a co-worker who used drag-and-drop for common editing in NEdit in 02005. On that team we used pair programming, so I had the opportunity to observe my co-workers' editor habits in detail. In more recent work I have not had that opportunity.