Wow, that's unbelievable. That solution is incredibly convoluted for such a simple operation. Imagine if a word processor required you to do this every time you wanted to change the name of something.
I don't understand how such an obvious feature could have been left out of the software.
Also, that voting area... seems to be unused by the devs. I don't think they take requests from there.
To be clear on what this feature should do:
If you press CTRL-F, a find and replace window should come up where you can type in a string to find (and replace). There should be THREE checkboxes in there. One for "Thought Titles" and one for "Thought Notes", and one for "Preview Replacements". Depending on which ones you check, the program should include these in its search and replace operation. And before doing the replace, it should give you a count to let you know how many there are.