I mean, they're not extraordinarily close per se, but they definitely won't look like ants. And you're practically center of stage, which is really good for both audio and visual. I've seen DMB there a few times myself, which years have you gone? I was there in '04, '05, and '08.
It is for me too. Your seats should be pretty good. I definitely wouldn't pay the extra to sit right in front of the lawn, but you're far enough forward that it's worth it in my opinion. I've been buying tickets to Lakewood for years, and the seats that I landed this morning are the best I've had for any show. There are so few seats in the 100's, you really have to know somebody or be a long time member a fan club to get those.
Got two seats two rows behind the 100's, just off to the right of center stage. Honestly, it won't get much better than that. I'm almost positive the 100's are not on sale for this pre-sale, and the chances of getting the 100's in the general sale tomorrow are very, very slim. Just weigh your options, decide whether it is worth it to pay the extra $60 a seat to sit in the pavillion.