I installed a new Betamarine25, in 2018. This replaced a high-hour Universal M25XP. It was a massive upgrade in less vibration/noise, ease of oil changes, and total cleanliness of the whole engine compartment. I have almost never used the glow plugs at all, except for about 3 or 4 seconds on a day when it's under 40 F. Really even then more out of habit.
I starts so easily. The access to the transmission dip stick is a nice improvement as well.
The drill when starting is actually similar to what I was used to with our prior Universal, which was also based on a Kubota block.
Throttle at about a third forward, neutral. Almost never any pre-heat.
I would likely pre-heat tho, when the ambient is at 32 F or below.
Interesting bit of trivia: my dock neighbor changed his Yamaha 33 engine from the factory Yanmar YSM12 to a new Yanmar twin, He said he would have preferred to go with the Betamarine, but the Yanmar fit his stock location under-V berth better. He's
very happy with the new engine.
I would hazard a guess that, like our experience, having a new current-technology diesel kinda made your boat seem "all new again"... !

(I have never helmed a Y-30, but have a lot of happy hours driving a Yamaha 33, and it handles wonderfully. Very high pedigree boats, they are.