I agree. My twice exceptional son has that "something that gets in the way of showing his abilities" on the performance section of an IQ test--a disability that affects visual motor integration and a slight visual processing difference, but even on a bad day when he is getting a migraine and has not had enough sleep, his mild disabilities do not seem to affect the verbal abilities. Even when he is in pain, he is still very articulate just like his geology professor aunt, his highly paid executive uncle, my uncle who was a commercial artist and my mother who I thought was the smartest person in my family until she became disabled. Two of my dad's brothers were engineers, but one didn't seem as articulate unless forced to talk. My husband is also very articulate but he doesn't think he is because he came from a family of all smart people and was in military intelligence with a group of people who later became doctors, lawyers, etc. I go with him to the MI reunions and I don't talk because I feel like I sound stupid, but my son fits in. I would love for people to describe me as personable and articulate like my son and my husband but I just don't have that innate ability. My son's verbal giftedness showed up in spite of being homeschooled by me and and in spite of having to learn more on his own than anything else because he learned so differently from me.
Some of my family members are really smart and some are not--like me, so I grew up noticing the difference. I don't know my IQ but I found a chart listing average IQ for different occupations and I had jobs in accounting, executive assistant, and stenographer so I think my IQ was probably only in the 120's. I usually made straight A's in school and I think with that IQ it is easy to do.
My son really is smarter than I am. He learned to read at 2 without being taught even with a disability that should have made it harder for him to learn to read. I am very aware of the difference in intelligence between my son and me, but I think if I had been tested I would have scored higher on "performance" because I had excellent fine motor skills and no disability to impede my speed on taking tests. I always thought my ability to write quickly on timed tests, especially government, civil service type tests allowed me to answer more questions and therefore score higher on tests than the average person, but I don't believe I made higher scores on these tests because I was smarter. I got a lot of interviews because of my high test scores, but I always felt I was lacking in the verbal intelligence and interpersonal intelligence that were more important for the jobs I was looking for.
I liked this chart that gives a range of IQ scores for different professions:
http://scienceblogs.com/gregladen/2009/08/income_iq_and_profession.php 
