Not everyone is allowed to install just any software they want.
Notepad++ is good if you can be a fan of regex, and if you have to convert a bunch of garbage text into something useable, there is a good chance you'll be a fan of regex.
SciTE would be better because it is designed to be a software editor, but it seems to require compiling the integral lexar (id's program structure) so that is something that PTC is in a better position to do.
As to what it is worth - PTC has to apportion money to keeping clients on maintenance and getting new clients. If competing software or poor user experience loses out on sales or licensing, that loss is what it is worth.
How much does it work out to? Compare the guess of 200 hours developer time to approximately 10 hours/year per company doing this task times the number of companies by the number of years a company will use the software. It's break even to the community if Creo has only 20 company-years. It's up to PTC to somehow decide if the benefit to the community is worth it.
I'd contrast it to the development of the Ribbon for Parametric. My gross estimate for that effort is between 10 and 20 man-years; 20 to 40,000 hours for a result that doesn't clearly benefit** anyone except marketing. This is not including the underlying development effort that goes into providing software functions - just the interface to them. It may be higher than that, but I don't know what level of QA support is given vs development effort.
**It's hard to claim benefit given that most people usually don't care about an interface, but 20-40% of people actively dislike the Ribbon interface over drop-down menus. This plus confounding of performance changes that are based on underlying software with the use of the Ribbon make it difficult to see any positive change for any but the least trained users, who don't use the sophisticated parts anyway.