Exciting job to do - there are few more fulfilling things in a reno than adding benchspace. Have you decided the bar will extend out past the end of the current benchtop, or will you sacrifice the end cupboard?

i reckon to get rid of breakfast bar and extend the bench but replace with 1 or 2 tall pantry cupboards. at the other end move the doorway along to center of wall. on the other side of kitchen where the oven is i would have pantry halfway along and bench the rest of way to fridge with oven under bench and stove top. you could even have a builtin microwave in the pantry area.

We use our breakfast bar ALL the time! Since there are only 3 of us at home, we eat at our brekky bar most of the time. Even when guests are around, unless it's more of a formal kind of setting, everyone usually congregates around there anyway (or wherever the chips & dip are!)

The 'breakfast bar' seems to be a thing, whether it makes sense or not. We have a meals area right next to the breakfast bar so we never sat at our breakfast bar and put a bookshelf under it instead and often thought how much nicer that would have looked if it had been built in. I have seen other houses with something shoved under the breakfast bar for useful storage because they do not sit at the breakfast bar. If you are at the planning stage you have the opportunity to avoid the 'shoved in as an afterthought' look. Of course some people do sit at their breakfast bar, and some use it even if there is a table nearby as well. That's what works for them. So it really does depend on your household and how you do things. It's not just about the floor plan you post, it's about what you tell us you need for how your household functions. For example space for x number of people to dine, somewhere to chat with friends while cooking, a wine fridge, somewhere for people to make tea/coffee if someone else is using the kitchen for meal prep, a cupboard for the dogfood, etc? For me I look at a breakfast bar and think 'potential valuable storage space'. But it's about what works for you. That's a good question from Dreamer about noise transfer. Who will be using those spaces and for what and how much will those various uses interfere with the adjoining spaces?