1. A system configured for automatic key frame extraction and storyboard interface generation for videos, the system comprising: one or more physical processors configured by machine-readable instructions to: obtain one or more videos having multiple frames, individual ones of the obtained one or more videos including a first video having a first set of frames; identify discrete shots in the individual videos, a given shot in a given video including consecutive frames of the given video, the identified discrete shots in the first video including a first shot and a second shot; determine features of individual frames; determine two or more groups of shots for individual videos based on the determined features, a given group including one or more shots of a given video sharing similar features, such that responsive to a determination of a first frame of the first shot including a first feature and a second frame of the second shot including a second feature, the first shot is assigned to a first group based on the first feature being similar to other features of other shots assigned to the first group, and the second shot is assigned to a second group based on the second feature being different from the first feature; select individual key frames representative of the individual shots, the first frame being selected as a first key frame of the first shot, and the second frame being selected as a second key frame of the second shot; effectuate presentation of the key frames in storyboard interfaces, a given storyboard interface of given video displaying corresponding key frames in a chronological order of the corresponding shots of the given video, wherein key frames of grouped shots of the given video are spatially correlated within the given storyboard interface, including effectuating presentation of the first key frame and the second key frame in a first storyboard interface, wherein the first key frame and other key frames of other shots assigned to the first group are spatially correlated in the first storyboard interface, such that an individual storyboard interface includes a two dimensional array, the array including a time-dependent dimension and a group-dependent dimension, wherein the chronological order of the shots of a given video is represented by positions of the key frames with respect to the time-dependent dimension and the grouping of the shots is represented by positions of the key frames with respect to the group-dependent dimension.