Many Orthodox Jews are comfortable with the concept of a Sabbath elevator, many aren't. (Majority consensus seems to be that it'd be perfectly alright for someone who is elderly/infirm/handicapped to use it to go up and down as much as necessary, but a healthy person should take the stairs, unless we're talking about a really tall building.
Eruv is by far a much more accepted thing. As gridlore said, it's been around for much longer. People who don't hold by the validity of an eruv tend to object more to specific minutiae (how the demarcation is made, along with other disqualifying factors like population living in the area [too big a population and you can't use an eruv no matter what] or geographical boundaries [an eruv can't cross a river, you can't put an entire island in an eruv]) rather than the actual eruv itself.
(Further, I'm not sure I'd do now what I did then, at least not with a little more thought. But that's just me.)
Re: Gentiles Arguing Jewish Minutae Is GO!
Many Orthodox Jews are comfortable with the concept of a Sabbath elevator, many aren't. (Majority consensus seems to be that it'd be perfectly alright for someone who is elderly/infirm/handicapped to use it to go up and down as much as necessary, but a healthy person should take the stairs, unless we're talking about a really tall building.
Eruv is by far a much more accepted thing. As
(Further, I'm not sure I'd do now what I did then, at least not with a little more thought. But that's just me.)