The greeting is disproportionately important because it is the first two-way moment: everything before it, the building, the signage, is broadcast, but the greeting is the first evidence of how this place treats me specifically. And the channel matters more than the content. Tone and body language, whether someone looks up, makes eye contact, seems unhurried, uses a name, carry most of the message; the actual words are almost interchangeable.
A few elements do the heavy lifting. Being acknowledged quickly, even a nod that says I see you, one moment, dissolves the invisible-newcomer anxiety. Being expected, greeted by name or with evidence that your arrival was prepared for, signals competence and care at once.
The practical takeaway for anyone designing arrivals: hire and train for attention rather than scripts. People forget the exact words of a greeting almost instantly; they remember precisely how noticed they felt.