I would say yes, Majors have become overly emphasized vs. other statistics. This is attributable to two things, first: Jack Nicklaus defined them as such and Tiger validated it as a goal to be matched and surpassed. I think total victories is important, total top 10 finishes, percentage of tournaments a golfer enters and wins, and more importantly money earned is super important. After all, these guys do this to make a living and if you are earning a lot of money that's a good measuring stick. After all, a century from now, with 100 more names on the Wanamaker Trophy and Claret Jug, will people really emphasize the winners so much? Hard to say, but if history is any guide, the measuring stick will likely be different. Case in point, in 1930 the four tournaments with the most prestige that Jones captured were the respective opens and amateurs. Your family, will however, remember for generations if you made $100 million playing the game, because they can live off the trust funds and lie on the beach drinking cocktails.
The second reason they have become overly emphasized is the media. 24 hour golf channels, scores on on-line media outlets, golf magazines. Hyping them up attracts eyeballs and dollars, thus the need to emphasize how important the majors are. This unintentionally diminishes everything else, many of which are just as interesting or important: the walker cup, amateur championship, collegiate golf, women's golf, etc.