I'm a Church geek - a Church junkie, if you will.
I simply LOVE organized religion, generally, and the LDS Church, specifically - for the community of believers and the chance to serve an extended family. I can work out my own intellectual understanding of the doctrines outside the meetinghouse, but I can't walk away from the service I provide to and within the community. Therefore, at certain points in the past, I have attended 6-9 hours of meetings most Sundays - and my wife and I were fine with that. I was there to help and serve, not primarily to learn - so I was pleased and gratified when I did learn something. It wasn't expected or required, so it was wonderful when it happened.
Having said that, the ONLY "required" meeting each week is Sacrament Meeting - for the sacrament, primarily. Attend that meeting, and "The Church" officially considers you to be "active". (Your local ward or branch won't consider you fully active, but you will be considered active from the global church's statistical reporting perspective.) In fact, if you have a job that requires you work most Sundays, but you attend Sacrament Meeting as often as you can (and are known to be "faithful and/or believing"), you still probably will be considered "active" by your Bishop or Branch President.
What I'm saying is that there are many, many "levels of activity" possible within the LDS Church for someone who wants to be "active" but can't or doesn't want to attend every possible meeting. Two simple examples:
1) I have a family friend who was raised with the idea that to be active he had to be involved in EVERY SINGLE SCHEDULED ACTIVITY, and it's taken him years to see that it's ok to miss this and that when there's something else on his calendar that is more important (including when he wants to go out on a date with his wife).
2) My wife and I once considered Home Study Seminary for my second son, who is diabetic and tired easily, but we didn't pulled the trigger on that because he wanted to have that time with his church friends each day. It worked out in the end, but if his health had started to be compromised by Seminary, we would have found an alternative for him.
What place should religion and religious activity play in your life? I can't answer that for others, but for me it is vitally important but secondary to my individual pursuit of righteousness and the development of a godly character. It acts for me as a strong motivation in that pursuit, and it should be whatever works for others in their current situations. After all, there is a time and a season for all things under the sun - and that includes "level" of church activity.