If you want to rename/correct a misspelling of a Block or replace some text, a Find-Replace function would be very helpful.
For example, here 'Table' needs to be replaced with 'Row' and the last '2' replaced with nothing (to simply remove '2').
There is also a use for 'Find'. For example, you might want to find, step-by-step, where a variable has been used (in order, say, to establish where it has been used in the wrong place).
Note, most Browsers have a 'Find' function that does work with AI2 Blocks, but you have to type-in replacements. Also, finding a block name (browser highlights all instead of step-by-step) can make the component palette fail.