FTB Ultimine (Forge)

3,181,789 Downloads Last Updated: Apr 8, 2021 Game Version: 1.16.5

This mod allows you to harvest multiple blocks at once if you hold ` / ~ key (configurable in Controls, change FTB Ultimine key). 1.15 versions also render white lines around blocks that will be mined.

You can also use hoe on grass in similar way to till multiple blocks at once:

And harvest crops by right-clicking on them:

Grass has special handling that looks for blocks further away than 1: