The best analogy I know of for people in tech, is that you should think of it like having a slightly faster processor with slightly bigger caches. You're more able to manipulate things in your head (thanks to having a bigger stack), react to stimulus faster, change focus easier, and so on.
Someone with a lower IQ is capable of the same tasks, but they are likely to need to expend more effort and time at achieving the same result. From observation I can say the difference is mostly marginal.
As a personal, anecdotal example: One of my parents is in the top 1% of the population, the other is in the top 2% of the population. I have observed many times that my parent in the top 1% will come to a revelation, and voice it -- and as they begin voicing the first syllable or so, the same revelation occurs to the other parent. It's quite amusing. [I feel I should add -- there are cases where the roles are swapped, but that usually only happens when their attentions are focused on separate things].
EDIT: Also note that having a high-IQ doesn't magically make you less-susceptible to bad teaching or incorrect explanations. There exists a sub-society of MENSAns who were told by their tutors that they were slow and stupid, and that they would never amount to anything, and who have low self-esteem and other problems from being told such things.
EDIT 2: An example of someone in science with a low-IQ (of 98), is Julia Robertson, known for her work on Hilbert's tenth question, and her work in decision theory: https://en.wikipedia.org/wiki/Julia_Robinson