I feel very wrong a bout the description of Socionics's Se, like it was wrote by some Se Polr people who hate Se the most. I know some real life INTjs whose really really hate Se user, and I think I understand why.
The differences between Se and Si, to my understanding is:
Si is dynamic, it focuses on tangible, direct (external) connections (introverted) between processes (dynamic) happening in one time, i.e. the physical, sensual experience of interactions between objects. Which mean, if a Si people see new object A, it will not only focus on A, but also focus on the connection between A and the objects around it (B,C,D for example). They will also compare those object with their past physical experience.
And Se, as opposed to Si, it wont focus on the connection between objects/past experience, but only focus on the objects alone. For example, If Se see object A, it will focus only on A, try to touch it dicrectly to observe the information of A.
Si user will be more careful when they are about to understand new object (physically). If they want to understand A, they will spend time to see all the space around it, things that connect directly to it. So, it will take time, and in Se user's eyes, that must be: "too slow/nitpick, just touch/feel it right now!" (Se polr will be very upset to hear that, and feel like they are being force to do something)
As Se user wont spend much time to see the connection, they will act quickly and directly, and to a Si user's point of view, they will see Se user as being "Reckless", and for someone that value both Ti and Si like INTj, they will see Se dom user as "stupid people, acting before thinking"
And all the craps about Se being organize are nonsense. Because Se is static, it wont focus on the connection of things, how could it be organize? It focus to put action directly to things it feel interest in (Ti/Fi). So it will be more about reckless and random action with high energy (in other people's eyes)
About it being forceful, power seeking, control..., I think there is a huge misunderstood of those who have blind Se. Se is very direct and can be seem as "brute force", but in truth, its the way it observe the information. It's an observing function, not Judging function. So, power seeking, control seeking are Nonsense. It's only look forceful when combine with other Judging functions.
I must say, as a Fe polr type, I feel the same way about Fe )