Global Blocks are the bomb. Copying and linking effect settings off a master, works like a charm.
One aspect doesn't work for me though: linked blocks share On/Off state.
That may come in handy in some cases (for ex. for globally bypassing the Stereo Enh.) but in other cases it's not.
Example:
I have a Phaser block with favorite settings (Global block #1). I use it in all my primary amp presets, in bypassed state.
I also want to use it in a couple of special fx presets, where it needs to be engaged. This doesn't work because engaging would engage the state phaser block in the primary amp presets too.
My solution so far is to copy identical settings to a Global block #2, where it's engaged, and use that. That's okay, I just have to remember to edit two globals when adjusting settings.
Ideally there would be the option "Link bypass too: yes/no" when linking a block.