There are a couple that we left out, e.g. Deluca Proposing to Sam before she ran away to Switzerland, or Alex proposing to Jo when she got out of the Mental Health facility - but overall we highlighted the main ones :)
Here are the episode numbers and timecodes for each proposal we talk about (in chronological order): Denny & Izzie (S2E26, 14:30), Cristina & Burke (S3E13, 39:50), George & Callie (41:27), Meredith & Derek (S5E19 38:40), Cristen & Owen (S7E1, 31:10), Teddy & Henry (S7E10, 37:10), Callie & Arizona (S7E17, 42:55), Ben & Bailey (S8E23, 26:30), Mathew & April #1 (S9E23, 26:00), Jo & Alex #1 (S10E1, 36:22), Jackson & April (S10E13, 41:20) Richard & Catherine (S11E23, 5:15 & 36:50), Jo & Alex #2 (S12E8, 38:50), Jo & Alex #3 (S12E23, 38:00), Amelia & Owen (S12E23, 39:30), Jo & Alex #4 (S14E15, 41:10), Matthew & April #2 (S14E24, 36:20), Owen & Teddy #1 (S16E10, 35:30), Maggie & Winston (S17E10, 37:45), Owen & Teddy #2 (S17E17, 23:30), Amelia & Linc (S17E17, 39:20)