In a large measuring cup or small bowl, whisk together the honey, lemon juice, 3 to 4 tablespoons olive oil, Dijon mustard, salt, and pepper until smooth; set aside.
Heat 2 tablespoons olive oil in a large skillet over medium-high heat until shimmering.
Season the salmon filets with a pinch of salt and pepper if desired, then add them to the hot skillet, skin-side up or down as preferred; sear for about 4 to 5 minutes without moving to develop a crust.
Flip the salmon and cook about 1 minute on the second side.
Carefully pour about half of the honey-lemon mixture into the skillet (reserve the rest for the salad dressing); the mixture will bubble—cook for 2 to 3 minutes more, spooning the sauce over the salmon as it thickens, until the salmon is just cooked through.
Remove the skillet from heat and let the salmon rest briefly in the pan while you assemble the salad.
On a large platter or in a salad bowl, arrange the romaine lettuce and evenly top with diced tomato, diced cucumber, and shredded cheese.
Top the salad with the glazed salmon and any sauce from the skillet; drizzle reserved vinaigrette over the salad as desired and serve immediately.