Jenna....your plan for time chunks with the kids is a great thing to do. Please know this...that time flies by and your kids will be grown so soon. Everything we do in life that is worth it has to be given an investment. That's our reason and obligation while we're here on earth. Things just don't happen by themselves. Just like in your M, and as an individual, as a parent and as a family, all of this requires that you make things happen. Even if they aren't feeling easy or you feel that you are have to work towards it, that's okay because you are building your life and soul while doing this.
Everything that is worth it requires constant attention, like any garden. Don't let the hard work scare you off, and tell your J this too. He must see what he stands to lose if he can't grasp this simple but hard principle. An if you both do this now at your ages, you will have a lifetime reward of a fulfilled family.
Don't forget the time chunks for you and him too! You are wise to understand the honeymoon phase does end, but can be replaced with a sweet knowledge that you two and kids are comfortable growing and living as a famaily.