Lots of mothers put the kids first but IMO it may not be the best, there needs to be much better balance once the kids can begin to care for themselves. After that point when they are going to school around ages 7-10, IMO the husband usually (but not always) needs to come first. By this time the "best" thing you both can do as a couple is to set a GOOD example on marriage, nurturing relationships, finance, balancing work w/other priorities and communicating during disagreements, etc.
Also for those who believe kids should always come first, do bear in mind that your husband is the person you consciously chose to marry and the kids are the family both of you created together. He is your husband and you have a marriage with him for better or worse. As such, both of you can care for the children's needs, it should not just be one individuals responsibility unless that is what you have both specifically agreed upon.
This may offend but the fact is ladies, if you do not spend more time with your husband, you will eventually restrict him to just being a money maker and the father. He will cease being your husband, best friend, lover and the person you decided to spend the rest of your life with. Is it really any surprise over 40% of marriages fail within the first seven years? IMO one of the keys to a successful marriage is make quality time for one another and not allowing those flames to fade, this is especially true for couples with children. Your children will grow old which is natural and healthy, but what is not healthy is allowing a marriage to succumb to the pressures of focusing solely on raising children, earning income, etc... there needs to be much better balance if either of you serious desire long term success in your marriage.