Moses has set up the tent of the meeting and the Israelites are afraid of God (and afraid of Moses) so every time Moses goes into the tent of the meeting to meet with God, the Israelites stand in their doorways and watch him enter, wait for him to come out, then worship once he's out.
And God spoke with Moses face-to-face, as neighbors speak to one another. When he would return to the camp, his attendant, the young man Joshua, stayed—he didn't leave the Tent.
Joshua didn't leave. That's important considering what I know about Joshua's story (which will come in about a week.)
Imagine spending that much time with God.