to build on this, Plato's use of dialogue form is also a rhetorical device: it normalizes the process of philosophy by having ordinary, though admirably noble, people engage in philosophical conversations. Phaedrus, for example, is a discussion, refutation, and replacement of a speech that phaedrus had heard earlier on.
he just happens to meet socrates while walking around athens, and it's certainly no accident when socrates mentions something along the lines of: "though I never leave the city, if we're philosophizing, i'm willing to go anywhere with you." the fluidity, poetry, and ease of reading his works is partly from plato's past experience as a poet, but i would say moreso as an extension of his intention to create philosophers.
plato aptly knew that dense treatises that alienated his audience was no way for them to ascend out of the cave and toward the light which is true knowledge. thus, the dialogue form, instead of an aristotelian treatise, was a way to bring people out of the cave.
at my university, the first-year courses barely touch on aristotle; plato gets all the love, for what i think is an extension of this. he's easy to read. fun, even. symposium is a masterpiece of literature and philosophy.
i recommend a volume called "plato as author" which has essays on this sort of thing. also, the cambridge companion to..., the yale lectures online, and any and all secondary material.
most importantly, though, read his works with an open, perceptive mind. goodreads generally suffers from the same prejudice against plato: that he sets up straw-men and has socrates affirmed by compliant yes-men despite having flawed ideas. that's his trick: his readers are actively involved in the process of philosophy by disagreeing.
i'm rambling, but i love plato. cheers dudes.