Slice cucumbers into ¼-inch rounds. Toss with salt in a colander and let sit for 20 minutes to draw out moisture.
Rinse cucumbers under cold water to remove excess salt, then pat very dry with a clean kitchen towel.
In a large bowl, whisk together olive oil, lemon juice, minced garlic, and black pepper.
Add cucumbers and fresh herbs to the bowl. Toss well to coat evenly.
Let the salad rest at room temperature for 10 minutes to allow flavors to meld.
Top with crumbled feta and toasted pine nuts if desired. Serve cold or at room temperature.