I enjoy scaling meshes and lining things up via line of sight a lot of times, except in those cases that require perfect pixel snapping.
For most cases, I prefer scaling from the scale widget, with scale snapping either “off” or set to a very low value.
It’s extremely sensitive when scaling. I request a key you can hold while scaling to get fine tuned scaling.
Example: scale mesh using the scale widget, then hold down shift. It will switch to fine tuned scaling and allow you to scale things extremely finely and accurately.
This would be a massive time saver for me.
A workaround is to duplicate the mesh, then scale multiple meshes at the same time. It switches to a super fine scaling method, which is actually very convenient! 
I just wish I had access to this fine scaling method when scaling single meshes or blueprints.