Sorry. Misread this as a “Gramps Web” question rather than a Gramps-project.org “website” question.
No, you are not the only one. (see “wiki font color is too pale”) The default “Desktop” theme has a font line weight that is FAR too thin for my old eyes. Particularly when using a high-resolution display.
Use the “Mobileview” theme instead. (Link in the footer of each page.)
This is a temporary solution that only lasts until the browsing session cache is purged. A good reason to have a WikiContributor account is that it provides a persistent option to change that CSS Theme.
Another good alternative is to download one of the offline PDF manual. They are more readable and more searchable.