1.-NERDTreeFind (Have it mapped to ,nf)
2.-Adding the package name to a file and typing BundleInstall
3.-Basic window management... (Have it mapped to Alt+hjkl)
I know how to do all of these very easily from first week of serious usage. I'm using vim for less than a year and wouldn't call myself a "vim power user".
I think it's a little bit adventurous to judge an editor that popular for that long time based on seemingly (seeing the use cases you said) limited personal experience.