Job Title significance
Just as in the first example, putting your job title in your headline is crucial. It's an easy way to quickly tell people what you do. Moreover, LinkedIn's algorithm is likely to serve your profile in search results when someone is looking for an "Office Manager".
Former roles matter
Mentioning your former role at a well-known company like General Electric can give you an edge. This tells potential employers that you've already been vetted by a reputable organization and likely have the skills and experience they're looking for.
Experience matters
Quantifying your years of expertise instantly communicates your experience level. This helps recruiters quickly determine if you're a match for the positions they're filling. It's a clear signal that you have a wealth of knowledge and are probably very good at what you do.