I love to compare different time frames. Poetry can evoke the time of the subject. By a very careful choice of words you can evoke an era, completely throw the poem into a different time scale.
If a poem is not memorable, there's probably something wrong. One of the problems of free verse is that much of the free verse poetry is not memorable.
I love chapbooks. They're in some ways the ideal form in which to publish and read poems. You can read 19 poems in a way you can't sit down and read 60 to 70 pages of poems.
In the late 60s and early 70s, I did get interested in voices, and in narration and embodying the voice, making the poem sound like a real person talking.
It was less a literary thing than a linguistic, philosophical preoccupation... discovering how far you can go with language to create immediate, elementary experience.